Reputation
2,659
Top tag
Next privilege 3,000 Rep.
Cast close & reopen votes
Badges
1 12 26
Impact
~165k people reached

Apr
24
comment Why can't dark matter be black holes?
I removed the deliberately over the top artists impression :-)
Apr
20
answered Why can't dark matter be black holes?
Apr
11
comment Do the stars imaged by a telescope even exist at present?
@Carl - I want to know about the other missions - the ones aimed at stars :-)
Mar
25
answered Does the universe have a center?
Mar
23
answered Could there be a sort of “Molecular Destiny”?
Mar
14
answered Falling into Saturn or Jupiter, would we pass through it until we hit the nucleus?
Mar
12
comment What is behind the cosmological horizon barrier?
Just checked your profile and realised you certainly know the maths in much greater depth than I - so I am more than happy to believe that 2 is more likely :-)
Mar
12
comment What is behind the cosmological horizon barrier?
Option 1 or 2 both seem more likely than 3. The tricky thing is that the models could allow any of them to be true. Inflation can work as viewed for option 1 as easily as option 2.
Mar
12
answered What is behind the cosmological horizon barrier?
Mar
11
comment Can you damage your eyes viewing Venus?
Additionally, the OP probably only felt like they had arc-eye as their eyes were accustomed to the dark, and the contrast from Jupiter to Venus that night may have been a bit of a jump. It takes your eyes a while to adjust to changes in light level at night as your pupils are wide open.
Mar
6
answered What is the weekly average of coronal mass ejections the sun sends out?
Mar
2
comment How can I determine if my telescope mirror is parabolic?
Thanks for those links - really interesting!
Feb
29
answered Double image in binoculars
Feb
28
comment How is it that some nebulae are rotating and others are not?
I think you have partially answered your own question. There are all sorts of motion from very large to very small scale. The probability of the sum of these resulting in a net zero rotation is low.
Feb
27
answered How is it that some nebulae are rotating and others are not?
Feb
15
answered Polar ice deposits on the Moon - dispersed in permafrost loose rubble, or also massive/layered?
Feb
11
answered Have Sterling Engines Been Used In Outer Space?
Feb
4
comment Why is 1 AU the distance between the Sun and the Earth?
I think it does involve the earth as one of the two involved bodies. The other end of the 1AU line is at the sun.
Feb
3
answered Why don't any of the gas giants have moons of Earth's mass (or greater) that orbit them? Is this generalizable to exoplanet gas giants?
Feb
3
comment How far into space does one have to travel to see the entire sphere of earth?
according to Wikipedia, as linked by FrankH above, yes