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Posted: 2/23/2015 1:38:30 PM EDT
[#1]
Quote HistoryQuoted: When supernova 1987A blew, you would have absorbed a lethal dose of neutrinos at 1AU. Click on the image in this one to enlarge it. http://xkcd.com/681/ |
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Posted: 2/23/2015 2:46:49 PM EDT
[#2]
There's a hexagon on Saturn:
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Posted: 2/23/2015 2:59:32 PM EDT
[#3]
This is BX442. At 10.7 years ago this is the oldest observed spiral galaxy we know of. That's right, the light you are seeing in this photo is 10,700,000,000 years old.
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Posted: 2/23/2015 4:12:46 PM EDT
[#4]
Quote HistoryQuoted:
My 8 year old daughter just asked me if there is a planet with dragons... I showed her the Andromada image and let her see for herself that by the numbers... There most likely is a dragon planet... She is super excited... You didn't tell her about that planet in the Rukbat system? For shame!! |
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Posted: 2/23/2015 4:17:35 PM EDT
[#5]
Quote HistoryQuoted: Bump. Is is gay to bang trannies: 40 pages. Awesome science: 31 replies. Cool thread |
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Posted: 2/23/2015 4:33:38 PM EDT
[#6]
Quote HistoryQuoted:
This is BX442. At 10.7 years ago this is the oldest observed spiral galaxy we know of. That's right, the light you are seeing in this photo is 10,700,000,000 years old. http://www.dailygalaxy.com/.a/6a00d8341bf7f753ef019101a4fb28970c-pi Just to be clear, the left image is what we can resolve currently using Hubble and the right image is an artist's concept of what BX442 and its dwarf companion might look like. |
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Posted: 2/23/2015 4:36:06 PM EDT
[#7]
Quote HistoryQuoted: One day on Mercury lasts two Mercury years: http://www.skymarvels.com/infopages/images/Mercury%20Orbit%20-%20SkyMarvels.gif |
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Posted: 2/23/2015 4:36:59 PM EDT
[#8]
Quote HistoryQuoted: There's a hexagon on Saturn: http://38.media.tumblr.com/6312cbd0139f7762b3668fa778c99685/tumblr_n4pl17YEWp1qlyoivo1_500.gif |
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Posted: 2/23/2015 6:26:16 PM EDT
[#9]
Quote HistoryQuoted:
I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Quote HistoryQuoted:
Quoted:
Since what we see is light years old history, how much warning do we get when our universe has some final ending? Light seems to lie to us, not telling us what's now - it tells us what was. Just thinking out loud, actually thought of this last week - but it took this long to get posted. I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Except the signal would take 100 years to get to us, so it would only work for the person to be in it. And it would take at least 100 years to get there so they would only get to see what happened after they left. |
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Posted: 2/23/2015 6:30:56 PM EDT
[#10]
Quote HistoryQuoted: Just to be clear, the left image is what we can resolve currently using Hubble and the right image is an artist's concept of what BX442 and its dwarf companion might look like. Quote HistoryQuoted: Quoted: This is BX442. At 10.7 years ago this is the oldest observed spiral galaxy we know of. That's right, the light you are seeing in this photo is 10,700,000,000 years old. http://www.dailygalaxy.com/.a/6a00d8341bf7f753ef019101a4fb28970c-pi Just to be clear, the left image is what we can resolve currently using Hubble and the right image is an artist's concept of what BX442 and its dwarf companion might look like. |
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Posted: 2/23/2015 6:35:39 PM EDT
[#11]
Quote HistoryQuoted: Awesome video. Do they know what causes the hexagon? Quote HistoryQuoted: Quoted: There's a hexagon on Saturn: http://38.media.tumblr.com/6312cbd0139f7762b3668fa778c99685/tumblr_n4pl17YEWp1qlyoivo1_500.gif Vid of experiment at Oxford replicating the phenomenon:
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Posted: 2/23/2015 6:57:53 PM EDT
[#12]
Quote HistoryQuoted: It has to do with the fact that gas giants rotate slower at the poles (think length of day, not surface speed) than they do at the equator: http://en.wikipedia.org/wiki/Saturn's_hexagon Vid of experiment at Oxford replicating the phenomenon: Quote HistoryQuoted: Quoted: Quoted: There's a hexagon on Saturn: http://38.media.tumblr.com/6312cbd0139f7762b3668fa778c99685/tumblr_n4pl17YEWp1qlyoivo1_500.gif Vid of experiment at Oxford replicating the phenomenon:  |
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Posted: 2/23/2015 7:06:22 PM EDT
[#13]
A Pulsar (highly magnetic neutron star) rotates 716 per second. Think about it. It's about 5 times the size of the earth and spins at 716 full rotations per second!
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Posted: 2/23/2015 7:18:42 PM EDT
[#14]
For a comparison to the farthest galaxy lets look at the closest, Andromeda. This image is equivalent to taking a picture of a football field at 1 mile.
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Posted: 2/23/2015 7:50:09 PM EDT
[#15]
Quote HistoryQuoted:
A Pulsar (highly magnetic neutron star) rotates 716 per second. Think about it. It's about 5 times the size of the earth and spins at 716 full rotations per second! A pulsar can't get much larger than about 30 miles across.. Any larger and it becomes a black hole.. Most pulsars and varieties of neutron stars are around 15-20 miles across but have the mass of 3-5 suns.. A sugar cube of neutron star material weighs billions of tons.. |
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Posted: 2/23/2015 7:55:05 PM EDT
[#16]
Quote HistoryQuoted: It has to do with the fact that gas giants rotate slower at the poles (think length of day, not surface speed) than they do at the equator: http://en.wikipedia.org/wiki/Saturn's_hexagon Vid of experiment at Oxford replicating the phenomenon: Quote HistoryQuoted: Quoted: Quoted: There's a hexagon on Saturn: http://38.media.tumblr.com/6312cbd0139f7762b3668fa778c99685/tumblr_n4pl17YEWp1qlyoivo1_500.gif Vid of experiment at Oxford replicating the phenomenon: |
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Posted: 2/23/2015 7:55:21 PM EDT
[#17]
Quote HistoryQuoted: A Pulsar (highly magnetic neutron star) rotates 716 per second. Think about it. It's about 5 times the size of the earth and spins at 716 full rotations per second! High Res  There is a pulsar left over in the center of that big ball of gas. Here is what it looks like in the X-Ray: High Res  Size comparison:  What you are looking at is a disk of high energy particles orbiting and falling into the star. Some of the particles that fall in don't actually hit the star and are shot out in jets perpendicular to the plane of the disk. |
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Posted: 2/23/2015 7:56:46 PM EDT
[#18]
Quote HistoryQuoted: A pulsar can't get much larger than about 30 miles across.. Any larger and it becomes a black hole.. Most pulsars and varieties of neutron stars are around 15-20 miles across but have the mass of 3-5 suns.. A sugar cube of neutron star material weighs billions of tons.. Quote HistoryQuoted: Quoted: A Pulsar (highly magnetic neutron star) rotates 716 per second. Think about it. It's about 5 times the size of the earth and spins at 716 full rotations per second! A pulsar can't get much larger than about 30 miles across.. Any larger and it becomes a black hole.. Most pulsars and varieties of neutron stars are around 15-20 miles across but have the mass of 3-5 suns.. A sugar cube of neutron star material weighs billions of tons..  |
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Posted: 2/23/2015 8:00:04 PM EDT
[#19]
Quote HistoryQuoted:
A Pulsar (highly magnetic neutron star) rotates 716 per second. Think about it. It's about 5 times the size of the earth and spins at 716 full rotations per second! I don't know if thats accurate, but there is a star in the Tarantula Nebula spinning about 100x faster then the sun, and due to the rate of rotation and size is at about the limit, any faster and it will come apart. IIRC its noticeable flattened due to this. It was a while ago that I read about it. if I find the article I'll post it. |
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Posted: 2/23/2015 8:08:45 PM EDT
[#20]
PSR J1748-2446ad is the fastest-spinning pulsar known, at 716 Hz (period being 0.00139595482(6) seconds).[2] This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005.
It has been calculated that the neutron star contains slightly less than two times the mass of the Sun, within the typical range of neutron stars. Its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second. |
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Posted: 2/23/2015 8:21:32 PM EDT
[#21]
Quote HistoryQuoted:
PSR J1748-2446ad is the fastest-spinning pulsar known, at 716 Hz (period being 0.00139595482(6) seconds).[2] This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004 and confirmed on January 8, 2005. It has been calculated that the neutron star contains slightly less than two times the mass of the Sun, within the typical range of neutron stars. Its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second. Sorry about that, I was thinking the size of earth and you're correct, it's mass. Love this thread |
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Posted: 2/23/2015 8:23:43 PM EDT
[#22]
Quote History23 mins in and already mind=blown. 
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Posted: 2/23/2015 8:30:19 PM EDT
[#23]
Wonder how those X-Ray images were taken? In order to take an image you need a lens or mirror and lenses and mirrors should absorb the x-rays right? You use a sires of tapered tubes. The x-rays coming in at a low angle skip off the surface of the tube like skipping a rock on a pond and get focused like a lens.
 XMM-Newton  |
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Posted: 2/23/2015 8:58:06 PM EDT
[#24]
Quote HistoryQuoted:
Just wait till we get closeups of Pluto. The probe is about as far away from pluto right now as the earth is from the sun: https://pbs.twimg.com/media/B9B39ZzIMAAIWLK.jpg Quote HistoryQuoted:
Quoted:
Quoted:
Awesome photo. Seriously awesome. As someone else said, I didn't even realize we had photos like this yet. Thank you for sharing. This. It's astounding how much progress we've made in astronomy and physics in the last couple decades. When I was in college we still didn't have any direct evidence of exoplanets at all and now we've got pictures like this. https://pbs.twimg.com/media/B9B39ZzIMAAIWLK.jpg The Lowell Observatory in Flagstaff, the discoverer of Pluto, is having a lot of programs in March in anticipation of the spacecraft's pass. |
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Posted: 2/23/2015 10:53:00 PM EDT
[#25]
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Posted: 2/23/2015 11:03:38 PM EDT
[#26]
Comet Ikeya-Zhang:  A different comet picking a fight with the sun:  |
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Posted: 2/23/2015 11:10:11 PM EDT
[#27]
This kind of shit interests the fuck out of me, but the junior level astronomy class I'm taking right now is straight up kicking my stupid ass.
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Posted: 2/23/2015 11:16:45 PM EDT
[#28]
Quote HistoryQuoted: The Lowell Observatory in Flagstaff, the discoverer of Pluto, is having a lot of programs in March in anticipation of the spacecraft's pass. Quote HistoryQuoted: Quoted: Quoted: Quoted: Awesome photo. Seriously awesome. As someone else said, I didn't even realize we had photos like this yet. Thank you for sharing. This. It's astounding how much progress we've made in astronomy and physics in the last couple decades. When I was in college we still didn't have any direct evidence of exoplanets at all and now we've got pictures like this. https://pbs.twimg.com/media/B9B39ZzIMAAIWLK.jpg The Lowell Observatory in Flagstaff, the discoverer of Pluto, is having a lot of programs in March in anticipation of the spacecraft's pass. ... cool, I'll be in Flagstaff next month |
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Posted: 2/24/2015 1:49:47 AM EDT
[#29]
Quote HistoryQuoted:
Do you know what neutrinos and I have in common? We're both constantly penetrating your mother. Ha a scientist bar joke. |
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Posted: 2/24/2015 2:34:45 AM EDT
[#30]
Awesome thread
The size/scope of the known universe is simply mind blowing. For Amazon Prime subscribers here's a couple good shows/series they currently have streaming for free - The Fabric of the Cosomos Cosmic Journeys |
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Posted: 2/24/2015 2:14:53 PM EDT
[#31]
thanks for the great thread
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Posted: 2/24/2015 8:11:41 PM EDT
[#32]
Quote HistoryQuoted:
NASA decided it wanted to collect samples of material from a comets tail to see what it was made of. How did they capture the particles? The worlds most advanced and lightest ballistics gel: http://stardust.jpl.nasa.gov/images/gallery/aerogel_tracks.jpg Aerogel is some cool shit. 
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Posted: 2/24/2015 9:20:22 PM EDT
[#33]
This one is for Jinxsters. The Romans said that Phobos and Deimos ruled the battlefield. For the uniformed Mars is the Roman god of war and Phobos and Deimos are the gods of fear and dread respectively.
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Posted: 2/24/2015 9:37:31 PM EDT
[#34]
Please dont stop, i love this thread
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Posted: 2/24/2015 9:44:56 PM EDT
[#35]
Very cool thread.
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Posted: 2/24/2015 9:51:07 PM EDT
[#36]
Ever think the universe hates you? Get a big telescope to confirm:
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Posted: 2/25/2015 2:16:29 AM EDT
[#37]
My favorite constellation is Orion. It contains 3 Messier objects; M42, M43 and M78
M42 is called the Horsehead Nebula. It's easy to spot with the naked eye and you can see the horse detail with just binoculars. It's located at Alnitak, the first star in Orion's Belt. (contrary to what Zed says in MIB) 
With a decent enthusiast telescope, you can get an image close to this: 
Step it up to Hubble Infra-red, and you get this: 
Like the famous Pillars of Creation in the Eagle Nebula, the Horsehead Nebula is also a star nursery Next up is M43, AKA the Orion Nebula. It's located near the middle of the "sword sheath" below Orion's belt. It's said to be the easiest nebula to see with the naked eye. There are stars being born here too. 
M78 is a reflection nebula. If you draw a line between Alnitak and Betelgeuse, M78 is just outside it to the left. (closer to Alnitak) It's much harder to see than M42 and M43 but still is fantastic to see with enough magnification and resolution. 
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Posted: 2/25/2015 8:09:30 PM EDT
[#38]
On March 12th NASA is launching a probe to investigate how ejecta from the sun interacts with the Earth's magnetosphere: http://mms.gsfc.nasa.gov/
Mission overview: |
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Posted: 2/25/2015 8:16:55 PM EDT
[#39]
Quote HistoryQuoted:
Fascinating. Indeed. |
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Posted: 2/25/2015 8:32:37 PM EDT
[#40]
Planets orbits are not circular, they're elliptical, or in other words oval shaped. These orbits precess over time. This means that the the point in the orbit farthest from the sun moves over the years:
 Earth axis of rotation is also tilted 23° away from the line perpendicular from our plane of orbit. This tilt which gives us our seasons also precesses:  Earth's axis precession takes 26,000 years a cycle so we won't need a new north star anytime soon. Due to the Sun's gravity warping space-time Mercury's orbit precession can't be explained through Newton's laws of gravity. We had to wait for Einstein's law of general relativity for a predictive model. Calculations predict that Mercury's orbit varies enough that it has a 1% chance of colliding with Venus in the next few billion years.  |
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Posted: 2/26/2015 2:39:59 AM EDT
[#41]
I can't wait for this, need to find a remote spot somewhere in SC to observe it.
Total Solar Eclipse 8.21.2017 http://www.eclipse2017.org/2017/path_through_the_US.htm |
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Posted: 2/26/2015 3:22:15 AM EDT
[#42]
Quote HistoryQuoted:
NASA decided it wanted to collect samples of material from a comets tail to see what it was made of. How did they capture the particles? The worlds most advanced and lightest ballistics gel: http://stardust.jpl.nasa.gov/images/gallery/aerogel_tracks.jpg Aerogels are amazing in about the same way as the Shuttle tiles are. Ridiculously well insulation combined with very low weight. They aren't very similar in reality, but they are in the way that they're amazingly weird materials with extreme properties. |
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Posted: 2/26/2015 3:25:59 AM EDT
[#43]
Quote HistoryDidn't know that there was a NASA blooper reel
But any of those could have been a life-threatening event in reality. I'm sometimes amazed that the Apollo program never had any casualties during flight. |
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Posted: 2/26/2015 3:51:55 AM EDT
[#44]
Quote HistoryQuoted:
The dirty Swedes have a scale model of the solar system. It's roughly 1:20,000,000. http://upload.wikimedia.org/wikipedia/commons/b/bd/Mars_model_of_Sweden_solar_system.jpg "Uranus (2.6 m in diameter) was vandalized and the new model is planned for somewhere in Gävle, 143 km from the Globe." |
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Posted: 2/26/2015 5:39:15 AM EDT
[#45]
Astronomers have discovered a black hole with 12,000,000,000 solar masses! The event horizon (Schwartzchild radius) reaches out as far as the distance from the Sun to Pluto!
This is current news, just released. Scary Huge Black Hole |
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Posted: 2/26/2015 6:16:48 AM EDT
[#46]
Has a list been started for anyone who wants to go?
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Posted: 2/26/2015 6:23:32 AM EDT
[#47]
Quote HistoryQuoted:
Right now the odds are pointing towards the universe ending in heat death long after the sun dies out. Basically the the universe will expand faster than gravity can pull matter together. If humans don't colonize other planets (which is impossible for the foreseeable future) the sun will kill us if we or an impact don't do us in. ETA: Evolution could do us in in a number of ways too. Quote HistoryQuoted:
Quoted:
Since what we see is light years old history, how much warning do we get when our universe has some final ending? Light seems to lie to us, not telling us what's now - it tells us what was. Just thinking out loud, actually thought of this last week - but it took this long to get posted. ETA: Evolution could do us in in a number of ways too. You mean like a shark-velociraptor-santa hybrid with an inherent zombie virus? `cause that's the direction I always imagined evolution heading... |
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Posted: 2/26/2015 6:47:58 AM EDT
[#48]
Quote HistoryQuoted:
I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Quote HistoryQuoted:
Quoted:
Since what we see is light years old history, how much warning do we get when our universe has some final ending? Light seems to lie to us, not telling us what's now - it tells us what was. Just thinking out loud, actually thought of this last week - but it took this long to get posted. I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Math, you would see 200 years back. 100 years to the telescope, then 100 years from telescope to you on earth. Unless you figure out a way to send the information faster than light. |
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Posted: 2/26/2015 8:38:31 AM EDT
[#49]
Quote HistoryQuoted:
I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Quote HistoryQuoted:
Quoted:
Since what we see is light years old history, how much warning do we get when our universe has some final ending? Light seems to lie to us, not telling us what's now - it tells us what was. Just thinking out loud, actually thought of this last week - but it took this long to get posted. I always wondered about this myself. If you could place a super powerful telescope 100 light years away, pointed at the earth, you'd be able to see a 'live' view from 100 years ago. I don't believe time travel is possible, but this makes it theoretically possible to have a window looking at the past. Or better yet, find a unique geometry of space that allows a near 180degree bend in the light incident from earth's AoA. This way we can keep the telescope local and see back 2x as far... Resolutions be damned!
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Posted: 2/26/2015 11:35:15 AM EDT
[#50]
I need to read this at home so I can see the whole picture
Rather than scroll around on my phone. Posted Via AR15.Com Mobile |
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