Apparently, this user prefers to keep an air of mystery about them.
12 How would I measure that I'm at a pole? Nov 20 '13
6 What reason is there to doubt the existence of the hypothesised planet Tyche in the far distant solar system? Oct 31 '13
4 How does a Bahtinov mask work? Nov 18 '13
3 How far is the Earth/Sun above/below the galactic plane, and is it heading toward/away from it? Oct 30 '13
2 Why do black holes have jets and accretion disks? Oct 30 '13