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Comet Lovejoy is seen behind the yellow-green line of atmospheric airglow, which lies roughly at the boundary between outer space and Earth at an altitude of 100 km. Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum ...
Portal:Space/Intro/3 Space (or outer space) describes the vast empty regions between and around planets and stars. The study of these, and other, astronomical objects is called astronomy, one of the oldest sciences. It is often said that space exploration began with the launch of Sputnik 1, the first man-made object to orbit the Earth.
In physical cosmology, the Big Bang is the scientific theory that the universe emerged from a tremendously dense and hot state about 13.7 billion years ago. The theory is based on the observations indicating the expansion of space (in accord with the Robertson–Walker model of general relativity) as indicated by the Hubble redshift of distant ...
Color-composite image of the Pleiades from the Digitized Sky Survey. The Pleiades (also known as M45 or the Seven Sisters) is an open cluster in the constellation of Taurus.It is among the nearest to the Earth of all open clusters, probably the best known and certainly the most striking to the naked eye
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The Eagle Nebula (also known as Messier Object 16, M16 or NGC 6611) is a young open cluster of stars. The nebula is an active region of star formation. Light from the bright, hot, young stars near the centre of the cluster illuminate the clouds of hydrogen gas and dust still collapsing to form new stars.
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