Community Digest

Top new questions this week:

Is the center of our galaxy, the Sagittarius A* black hole a former star?

If a black hole comes from a dying star, do we have a record or proof that our galactic center was once a huge ball of burning plasma? I'm not an astronomy student.

the-sun black-hole galactic-center  
asked by TheRobloxGamer Score of 18
answered by Glorfindel Score of 26

Why didn't Kessler Syndrome prevent planet formation?

In 1978, Donald Kessler proposed that space pollution in orbit around the Earth could enter a collisional cascading state. This means debris would collide with satellites, generating more debris, ...

planetary-formation collision solar-system-evolution  
asked by Connor Garcia Score of 5
answered by PM 2Ring Score of 7

Why are what end up being meteorites not in stable orbit as planets and large asteroids are?

We don't have to worry about Mars, etc. hitting Earth. Is it that, being smaller, small asteroids have less inertia and so are more affected by, I guess, the gravity of various planets?

gravity asteroids orbital-mechanics meteorite  
asked by releseabe Score of 4
answered by James K Score of 4

Solar flare generate energetic protons. Where do the electrons go?

A solar flare sends many atoms in space (mainly He and H), many of which, when they reach Earth, are ions (He++ and H+). What I recall from my school days, is that an electron goes from one atom to ...

solar-flare proton  
asked by Alexis Wilke Score of 4
answered by planetmaker Score of 4

Have astronomers taken into account the fact that red-shifted light from far-away stars is also very old when studying the expansion of the universe?

I am aware that Hubble discovered that the further away a galaxy is the greater its redshift. What I don't understand is how astronomers can be sure that distant objects are still moving at greater ...

asked by Joe Bond Score of 3
answered by ProfRob Score of 4

How do you clean a foggy or dirty eyepiece of a telescope?

I'm wondering what the procedure would be to clean the eyepiece of a telescope when it looks foggy or there's dirt either on the outside or inside it. I can get rid of loose dirt with a camel hair ...

telescope amateur-observing eyepiece  
asked by 299792458 Score of 2

Orbital speeds of Components of Binary System

How does one calculate the orrbital spped s of the members of a binary system? Iirc, the average separation of Alpha Centauri A and B is 23 AU, but the orbit is highly elliptical, so that the ...

asked by Mike Stone Score of 2
answered by Connor Garcia Score of 5

Greatest hits from previous weeks:

What are the differences between matter, dark matter and antimatter?

I thought dark and anti matter were kinda the same, but after saw a video, they mention that dark matter is not antimatter but their explanation is a little fast so I got doubts. What are the ...

dark-matter matter antimatter  
asked by Alex Sifuentes Score of 17
answered by Florin Andrei Score of 13

What is the name of our Solar System?

what is our Solar System called rather than "the Solar System"? I've found "Sol System" and "Monmatia", too, but is there more to it?

solar-system naming  
asked by user7518 Score of 14
answered by Peter Erwin Score of 12

Are there any studies that prove/disprove the Oscillating Universe Theory?

Is there any evidence that supports or disproves the Oscillating Universe theory? What kind of observations could provide this evidence?

asked by signsgeek Score of 3
answered by Sir Cumference Score of 6

What would happen if an ice cube is left in space?

Recently I boarded a flight and noticed outside air temperature as -53°C at an altitude of 36860ft (11.23km). I don't know what causes such a freezing temperature in that altitude but was wondering ...

space temperature water  
asked by Praveen Kadambari Score of 52
answered by Mark Score of 88

Why do the planets orbit in the same direction?

Theoretically, planets would have an approximately equal chance of going one way in their orbit or another but in reality, this is not the case (at least in our solar system). Why is this?

planet orbit solar-system  
asked by HotSaucey Score of 27
answered by Sir Cumference Score of 45

Why do Black Holes in the middle of galaxies not suck up the whole galaxy?

As stated in several sources, it's supposed that in every galaxy there is a black hole in the middle. My question is, why do these black holes in the middle of galaxies not suck up all the ...

black-hole galaxy  
asked by OiRc Score of 45
answered by Phiteros Score of 85

Line of lights moving in a straight line, with a few following

My husband and I have just seen a line of about 15 lights moving in a straight line, quite high above the cloud level with a gap, and then 5 lights, a gap, another few, a gap, 1 light, a gap, and a ...

satellite identify-this-object  
asked by Sue Melvin Score of 14
answered by James K Score of 22

Can you answer these questions?

What would be the noticeable effects (if any) if the Earth's orbit entered a chaotic trajectory?

To set the stage, let's put some more specific assumptions: I am specifically thinking of a binary-single type interaction where the Earth is the intruder on a binary system of two bodies of a ...

life chaos three-body-problem binary-single-interactions  
asked by Justin T Score of 2

Telescope's eyepieces got blurry over time

Right at the beginning: This is not a duplicate of questions involving blurry images through their eyepieces. I only get blurry images for 2 of my 3 eyepieces so it's not the telescope's fault and in ...

telescope amateur-observing eyepiece  
asked by 299792458 Score of 2
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