A spectacular journey to the birth of stars and matter a billion years after the big bang. Scientists look for evidence of an extraordinary phenomenon known as the Cosmic Dawn, a dramatic moment in the history of the universe when the very first stars were created.
2015 • Astronomy
How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the distance to and the sizes of the Moon and Sun. Once the Earth/Sun distance was found, parallax was used to find the distance to nearby stars, and that was bootstrapped using brightness to determine the distances to much farther stars.
Cassini-Huygens has given us a more detailed account of Saturn than we could have ever imagined. Breathtaking images of Saturn and its sparkling rings, a massive 6-sided polar storm, and 62 moons - including the most bizarre worlds in our Solar System -- we have seen them all thanks to Cassini.