Sentences with phrase «by dark matter clouds»

Not exact matches

The most plausible answer was the galaxies also contained clouds of what they dubbed «dark matter» that could not be seen by conventional means, but which exerts a gravitational tug.

By measuring the velocity of the gas and its distance from the dark cloud where it originated, estimating its age was a simple matter.

The case for dark matter began in the 1930s with a pair of papers by two very different kinds of geniuses, the buttoned - down Dutch astronomer Jan Oort (who also hypothesized the Oort Cloud of comets) and the explosive Swiss - American cosmologist Fritz Zwicky.

Perhaps just as incredible, the clouds of hot interstellar gas formerly contained by the galaxies — and superheated by the collision so they glow in x-ray light — seem to have been grabbed by the dark matter instead of being flung into space.

Observations of the orbits of stars around galaxies suggest that all galaxies, including the Milky Way, are surrounded by a spherical cloud of dark matter (see diagram).

The Milky Way (like other spiral galaxies) is surrounded by a large halo region which contains globular clusters, large clouds of hydrogen gas, and a huge mass of the mysterious dark matter.

Some are found in globular clusters, but most move in a huge cloud around the disk called the galactic halo, which has a luminous inner component defined by globular star clusters and other easily observable stars (with coronae of hot gas possibly expelled by supernovae and of high - velocity neutron stars) and an outer dark - matter component inferred from its gravitational impact on the Milky Way's spiral disk.

In 2007, a similar collision with the Milky Way was projected for Smith's Cloud within 20 to 40 million years, which is now believed to be surrounded by a massive halo of dark matter so that the entire incoming object has a «tidal mass» of some 300 million Solar - masses.

Comerón's scenario, however, was considered to be unlikely for a tenuous gas cloud until astronomers came to realize that such clouds could be held together by a massive clump of dark matter.

SDSS studies have probed the dark matter environments of quasars through clustering measurements, revealed populations of quasars whose central engines are hidden by obscuring dust, captured changes in quasar spectra that show clouds moving in the gravitational grip of the central black hole, and allowed a comprehensive census of the much fainter accreting black holes (active galactic nuclei, or AGN) in present - day galaxies.

Brown clouds contain dark aerosols such as soot that are released into the atmosphere by burning organic matter.