Blog Post 5: A Sky Full of Ghosts

Blog Post 5: “A Sky full of Ghosts”

In this episode of the Cosmos: A spacetime Odyssey, Neil DeGrasse Tyson discusses the nature of light in the Universe.  In the episode NDT makes the point about how the stars we see in the sky are from galaxies millions of light years away and how since light travels from a great distance, what we see in the sky is what happened several million years ago. NDT also discusses how stars give off light to allow us to observe them and introducing the idea of dark stars, which are not seen but can be tracked via other stars. Tyson ends the episode by discussing the nature of black holes and uses the ship of the imagination to convey the warping of spacetime and time dilation as one enters the event horizon of the black hole.

This is one of my favorite episodes so far because of Tyson’s segment on Black Holes. Black Holes are one of my favorite subject and Tyson’s animations towards the end made confusing concepts easier to understand. Although the idea of Dark stars is confusing, Tyson does a good job explaining it which helped me understand them a bit better.