Roman Alexander

Is our Solar System the odd one out in a universe full of chaos?
Why can’t we see dark matter and how do we know we don’t underestimate the gravity pull of black holes?
How do we know the chemical composition of alien planets?
Books we love: Robert M. Hazen – The Story of Earth: The First 4.5 Billion Years, from Stardust to Living Planet (Penguin Books, 2013)
Is there an ending point or an edge of our Universe?
Does a black hole emit anything on the other size of the event horizon? How do we know which side of a black hole is which? Would it be possible for radiation from a supernova event, to travel through a black hole?
How does dark matter hold a galaxy together and how do we know where dark matter is more or less dense?
Is there anything between galaxies?
How is the luminosity of cosmic objects measured and what are the parameters astronomers use?
Astronomers we love: Michelle Thaller, assistant director for Science Communication at NASA’s Goddard Space Flight Center