2,424 reputation
1024
bio website infosecfrog.blogspot.com
location Scotland, United Kingdom
age 43
visits member for 3 years, 4 months
seen yesterday

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...
Jan
2
comment How can we know, today, that there's something from 100 light-years from here?
@TomBrito - but we can tell which ones are the same or similar.
Dec
7
comment How can we know, today, that there's something from 100 light-years from here?
If you look at a car in the distance, what you are seeing is light that has travelled from it to your eye. We can work out how far it must be by comparing how small it looks against other cars. There are similar techniques to compare a distant star to others that look similar.
Dec
6
awarded  Critic
Dec
6
awarded  Citizen Patrol
Nov
22
answered The Sun as a gravitational lens
Nov
19
accepted Are there trends in the number of meteors in a shower year on year?
Nov
6
asked Are there trends in the number of meteors in a shower year on year?
Oct
13
comment Parallax Cloud Displacement - Angular Distance from Geostationary Satellite
If this doesn't get an answer here, I'm guessing math.stackexchange.com could rustle one up for you pretty easily
Oct
10
answered Why do rockets need a cosmic ray detector?
Oct
6
comment What is the extent of the universe?
@Developer - no, it doesn't mean the universe is infinite (I don't know whether the maths suggests that or not) all it means is that we can see a long long way but that isn't right to the edge of the universe.
Oct
6
answered Can neutrino detectors tell what direction the neutrinos came from?
Oct
6
comment What is the extent of the universe?
humans can't visualise 28 billion parsecs, but that is the diameter of the observable universe - those numbers are entirely physical, just very very big. As @Joe said, that is as far as our telescopes can see, and as our telescopes get better we can see further.
Sep
21
comment Are planetary orbits measured from the Sun's surface or centre?
:-) I guess I asked for that
Sep
21
comment Are planetary orbits measured from the Sun's surface or centre?
in our solar system?