Live session with Chris Impey for students of the Astronomy: State of the Art MOOC on Udemy. All space science questions or questions about the course welcome.

0:48--Did you see comet ISON ?
2:25--Has the presence of water vapour been found in hot jupiter's?
5:08--Your thoughts on Hawkins new theory on black holes
7:47--Why do low mass stars have greater lifetimes than the large mass stars?
11:20--In one video lecture it is mentioned that some pulsars are denser than an atomic nucleus. What is the density of an atomic nucleus and what is an atomic nucleus composed of? What is an atomic nucleus?14:36
14:36--What is an interferometer and how does it work?
20:12--Is there any new information on dark matter and dark energy lately? Are we making any progress to understand these concepts better?
30:12--Would we ever see something like SN1054 in our lifetime? Can you talk about the recent supernovae that have been observed? Why are they so important for astronomy?
34:26--Really technical one. Ages of galaxies can be determined by Mg/Fe ratio I believe. How do these elements get generated differently to be so used?
40:12--What is the likelihood of Comet Holmes 17P exploding and causing and a spectacular sight from Earth as it approaches Perihelion on the 27 March 2014
42:20--If all matter was concentrated into a very dense, hot, tiny space during the Big Bang, why did gravity not collapse it into a black hole?
45:57--Hubble discovered Cepheid variables in M31. Cepheids, being "standard candles," helped Hubble determine the distance to the galaxy. What makes a Cepheid variable so standard? I'd think there'd be an infinite variability of variables in the Universe.
53:58--How can scientists determine whether a free floating "orphan planet" in space is actually a planet or a failed star.

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