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expanding universe
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Learn about space expansion and why gravity and electromagnetism are not affected when space expands
Einstein, the big bang, and the expansion of the universe
Understand the theoretical model of dark energy and the acceleration of the universe
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
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Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
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Learn about space expansion and why gravity and electromagnetism are not affected when space expands
Einstein, the big bang, and the expansion of the universe
Understand the theoretical model of dark energy and the acceleration of the universe
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Key People

Edwin Hubble
Edwin Hubble
American astronomer
Willem de Sitter
Dutch mathematician and astronomer
Vesto Slipher
American astronomer

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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy