Apparently, this user prefers to keep an air of mystery about them.
13 How are interplanetary trajectories found? Aug 7 '11
10 How can a black hole emit X-rays? Jun 2 '11
7 Can any telescope be used for solar observing? Jun 2 '11
5 How bright will an asteroid be? Nov 4 '11
4 Why isn't sunset time in sync with solstice? Oct 25 '11
3 Are there websites or programmes that permit a simulation of the night sky in the past and the future on an ordinary computer? Jun 4 '11
2 Ways of verifying the origin of a meteorite? Jun 3 '11