A computer simulation depicting a large chunk of our universe
G. L. Bryan, M. L. Norman, UIUC, NCSA, GC3

The Cosmos

Cosmology is the study of the overall structure of the universe. And just what is the Universe? Quite simply, it is everything that exists. However, from Earth we cannot observe everything in the Universe. Some things are dark (brown dwarf stars, planets, and Dark Matter) and we cannot see them. Additionally there are parts of the universe whose light has not yet reached us in this part of the Universe. The observable universe is the Universe that reveals itself through electromagnetic radiation that can be detected on Earth. And because that radiation travels at a finite speed we actually look back in time when we look into the cosmos.

Astronomers observe some rather interesting and perplexing structure in the Current Universe. That structure can tell us much about the History of the Universe. It can also tell us what we can expect for the Future of the Universe and beyond...

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Galaxies

The introduction of telescopes to the study of astronomy opened up the universe, but it took some time for astronomers to realize how vast the universe could be. Telescopes revealed that our night sky...more

Neutron Stars

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Spiral Galaxies

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA