2,370 reputation
923
bio website infosecfrog.blogspot.com
location Scotland, United Kingdom
age 42
visits member for 3 years, 1 month
seen Apr 11 at 17:18

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 face of earth?
according to Wikipedia, as linked by FrankH above, yes
Feb
2
comment The Moon during the day
Earthshine is not what makes the moon visible during the day - it is the sun's rays reflecting off the moon that make it visible. Earthshine is what lets you see (dimly) the dark areas of the moon at night
Feb
2
comment The Moon during the day
@YUASK - it is more visible when full than when new, but also, 50% of the time you can't see it in the sky during the day because it isn't in the sky at all, but round the other side of the world.
Feb
1
answered Is it safe to observe the sun through binoculars with welding glass in front?
Feb
1
answered Automated telescope system
Jan
31
comment How far into space does one have to travel to see the entire face of earth?
there you go - think my geometry is right
Jan
31
answered How far into space does one have to travel to see the entire face of earth?
Jan
27
answered Is it possible that I just saw Jupiter's moons?
Jan
25
comment How bright are auroras (aurorae)?
@KeithThompson Yup - lovely crackling and fuzzing noise!
Jan
25
comment How bright are auroras (aurorae)?
sadly, at 21 N, I don't think you're ever going to see one...unless something really big happens on the Sun
Jan
25
answered How bright are auroras (aurorae)?
Jan
23
answered sun-moon-earth anomaly
Jan
21
comment sun-moon-earth anomaly
I have never seen that effect - I need to check again in case my memory is flaky, but I always showed people that if they follow that perpendicular line they will hit the sun...