The universe began with a vast explosion that generated space and time, and created all the matter and energy in the universe. Exactly what triggered this sudden expansion remains a mystery.

Galaxies are the building blocks of the universe. Clusters of galaxies, and clusters of clusters of galaxies, called superclusters, make up the structures in the geography of the universe.

You can now watch a broad selection of PBS programming on Amazon Prime for free even if you don’t have a subscription. Though ...

World-renowned astrophysicist, author and host of PBS NOVA's spinoff, " NOVA Science Now ", Dr. Neil deGrasse Tyson is coming ...