<p>From asteroid missions to space junk, astronaut Chris Ferguson answered your questions about all things space exploration. Check out the Beyond Earth exclusive below!</p> <p><iframe style="border: 0px transparent; float: left;" src="http://www.ustream.tv/embed/12395985?v=3&amp;wmode=direct" width="610" height="377" frameborder="0" scrolling="no"></iframe></p> <p><iframe style="border: 0px transparent; float: right;" src="http://www.ustream.tv/socialstream/12395985" width="240" height="377" frameborder="0" scrolling="yes"></iframe></p>