HDE 226868's user avatar
HDE 226868's user avatar
HDE 226868's user avatar
HDE 226868
Moderator
  • Member for 9 years, 7 months
  • Last seen this week
  • A small planet somewhere in the vicinity of Betelgeuse
86 votes
Accepted

How did Astronomers deduce that the Sun was not a ball of fire?

65 votes
Accepted

How old is the oldest light visible from Earth?

46 votes
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How is it possible that we haven't discovered anything in the Oort cloud yet?

42 votes
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Why didn't the Event Horizon Telescope team mention Sagittarius A*?

39 votes
Accepted

Why are radio telescopes often built into natural depressions?

38 votes
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If two white dwarfs collided, would they become a star?

35 votes
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What will succeed the Arecibo Observatory?

35 votes
Accepted

What's the difference between minutes and arcminutes?

34 votes

Why are there no gamma-ray bursts detected in our galaxy?

31 votes

Why can space telescopes see through a planetary nebula?

31 votes
Accepted

Do all stars have an Oort cloud or is it a rare occurence?

29 votes

Why is it okay to watch a sunset but not an eclipse?

29 votes
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Why are there so few supernovae in M31 (Andromeda)?

28 votes
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What is it exactly about these flares of infrared light from Sgr A* that "confirms" it is a supermassive black hole?

27 votes
Accepted

If Jupiter is a gas-giant then why don't its features change?

26 votes
Accepted

If dark matter bends light, how do we know the stuff in the sky is where we think it is?

26 votes
Accepted

Why are there not yet any instruments dedicated to registering time dilation caused by passing gravitational waves?

24 votes

"Next Generation Arecibo Telescope (NGAT)... would combine a 314-metre-wide platform with a swarm of 9-metre dishes on top" What would that look like?

24 votes

How are radio telescopes pointed?

24 votes

Why hasn't the "9th Planet" been detected already?

23 votes
Accepted

How many arms does the Milky Way galaxy have?

23 votes

Where does the Solar System end?

23 votes
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A "strange" unit radio astronomy

22 votes
Accepted

So, what exactly is an 'ultra-cool' dwarf star?

22 votes
Accepted

How distorted will our galaxy be if we are viewing it from several thousand light years away?

22 votes
Accepted

Why doesn't Titan have a carbon dioxide atmosphere?

21 votes
Accepted

Are stars expected to become dimmer before a supernova?

20 votes
Accepted

Is it possible to see Callisto with the naked eye when it's at its greatest elongation from Jupiter?

20 votes

What on-site equipment is installed with radio telescopes?

20 votes

Are we really star-stuff from the interior of collapsing stars?

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