What, or when, would aliens see, if they looked at the earth?
Answers to Space Science Questions
Answers to questions about space science, astronomy, rockets, planets, galaxies, stars...
20 March 2011
When you look at distant object like stars, the brightness will be controlled by two factors one the luminosity, and...
25 February 2011
25 February 2011
And what's Stephen Hawking's explanation?
23 January 2011
If light has no mass, and gravity is a property of mass - then how is light bent by gravity?