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Physics & Astronomy Facts

Hydra A is a galaxy cluster that is 840 million light years from Earth (redshift = .054). The cluster gets its name from the strong radio source, Hydra A, that originates in a galaxy near the center of the cluster.
Groups & Clusters of Galaxies

Galaxy clusters are the largest gravitationally bound objects in the universe. They have three major components: (i) hundreds of galaxies containing stars, gas and dust; (ii) vast clouds of hot (30 - ...
Venice as photographed by crew members aboard Space Station Alpha.
Astronaut Photography

Astronauts are trained in scientific observation of ecological, geological, geographic, oceanographic, environmental, and meteorological phenomena. They are also instructed in the use of photographic ...

What is Dark Energy?

Because he originally thought the Universe was static, Einstein conjectured that even the emptiest possible space, devoid of matter and radiation, might still have a dark energy, which he called a 'Co ...

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