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Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller groups and larger clusters. Our Milky Way is part of the Local Group, and will one day collide with the Andromeda galaxy. Clusters of galaxies also clump together to form superclusters, the largest structures in the Universe. In total, there are hundreds of billions of galaxies in the Universe.
39 • Crash Course Astronomy • 2015 • Astronomy
In the Orion constellation, Betelgeuse, a red star 1,000 times the size of the Sun, is an old star that scientists predict will soon come to a violent end. Will we see a supernova explosion 100 times brighter than a full moon in our lifetimes? Will the explosion release rays harming life on Earth?
3 • Cosmic Front • 2014 • Astronomy
Our universe's stars are dying off faster than new ones are born, and using the latest technology, experts investigate the secrets of the last stars of the cosmos and what this stellar apocalypse means for life on earth.
S8E4 • How the Universe Works • 2020 • Astronomy
The Known Universe takes viewers from the Himalayas through our atmosphere and the inky black of space to the afterglow of the Big Bang. Every star, planet, and quasar seen in the film is possible because of the world's most complete four-dimensional map of the universe, the Digital Universe Atlas that is maintained and updated by astrophysicists at the American Museum of Natural History.
Scientists and modern explorers are determined to send humans to Mars; as NASA builds its first spacecraft to carry astronauts to Mars and tech visionaries devise extraterrestrial colonies, future on Mars might be a reality.
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The latest discoveries suggest that we might be on the verge of discovering life beyond our planet, and scientists are investigating if earth's life began elsewhere in the universe, and whether we need to evolve to know for sure.
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