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1500 questions
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How would Earth's climate differ if it's axis were tilted around 90 degrees like Uranus?
As the title states, what would the effect on Earth's climate be if it's axis were tilted approximately 90 degrees like Uranus?
I'm specifically wondering about the effects on seasons, temperature, and life on Earth. However, I'm happy to hear…
Fezter
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Position of Neutron stars in H R diagram
Why is that Neutron Stars are never depicted in an H R diagram? They can be placed in the bottom right corner but you will never find any diagram in literature showing neutron stars.
seeking_infinity
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What is the temperature of an accretion disc surrounding a supermassive black hole?
What is the temperature of an accretion disc surrounding a supermassive black hole? Is there plasma in the disc?
Declan Konroyd
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Why can I see the whole moon during various non-full-moon phases?
Here's an image that describes the phenomenon I'm asking about. The very thin sliver to the left is of course the surface of the moon as lighted by the sun. But the rest of the moon is also faintly lighted -- by what?
I'm guessing that some amount…
TwoMice
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What is the angular diameter of Earth as seen from the Moon?
...today I must have left my brain home. I know it's a simple calculation but I keep failing simplest calculations today.
What is the angular diameter of Earth as seen from the surface of the Moon?
SF.
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Why are some planets so close to their star?
"Kepler-10b orbits its parent star once every 0.84 days, which means
it is more than 20 times closer to its star than Mercury is to our
sun" space.com
Are there any accepted theories that successfully predicted that so many planets would be…
Glen Little
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How long until we cannot see any stars from other galaxies?
Since all the galaxies are moving further away from each other at a faster and faster rate, eventually we won't be able to see stars from other galaxies. How long until we can't see stars from other galaxies?
Rich
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Detecting Deep Impact
There have been several accounts in media articles of asteroid near misses, many describe that the asteroid was not seen before the near miss.
After reading the question and answer to How can we tell if the asteroid 2013 TV135 will hit Earth in…
user2449
10
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Sedna, VP113 and the likelihood of the PX/Tyche/Thelistos hypotheses
Crosslisted question from https://physics.stackexchange.com/questions/131876/sedna-vp113-and-the-likelihood-of-the-px-tyche-thelistos-hypotheses
The recent discoveries in exoplanetary science (specially those findings of planets orbiting far far…
riemannium
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When will the Milky Way "arrive" at the Great Attractor, and what all happen then?
The Great Attractor is described as a location to towards which the Milky Way, along with all other galaxies in the Laniakea Supercluster are moving. How long will it take for the Milky Way to "arrive" there, and what will happen when it does —…
orome
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Fate of the Spiral Arms of the Milky Way and Andromeda
In a few billion years, the Milky Way and Andromeda will collide. Chances are, there won't be many spectacular stellar collisions, and there's a pretty good chance that the Solar system (and most other stellar systems) won't be flung out into deep…
HDE 226868
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With gravitational lensing, is it possible to mathematically compute the correct image of the galaxy that is being distorted?
There's been another report of gravitational lensing in the news. Wikipedia has a good image of an example of gravitational lensing taken by the Hubble Space Telescope. This brings me to wonder that, since they understand the math behind the…
Kevin Holmes
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Can two comets travel together as one?
If two comets come together in space, will they bounce apart, merge into a single body, or could they travel together through space, either touching or orbiting a shared center of gravity?
James Jenkins
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is there any theory or observational evidence that our universe is electrically neutral or not?
It seems our universe is neutral in large scale.
There is CP violation (wiki) problem with respect to matter and antimatter.
Similarly is there any theory about whether our universe is electrically neutral?
Cosmic rays are not neutral. However the…
questionhang
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Why does nuclear fusion generate heat?
I understand that nuclear fusion generates energy in the form of gamma-rays (as in the pp chain), but how does that translate into heat in the star's core? Or is the heat just generated by gravitational contraction?
After doing more research, I…
Astrovis
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