Sentences with phrase «neutral hydrogen atoms»

The telescope detects radio waves that have been emitted by neutral hydrogen atoms.

Until that time, the Universe was composed almost entirely of neutral gas in the form of neutral hydrogen atoms.

The shock wave then inflates and heats up the interstellar medium, which emits in the X-ray, and strips the electrons from surrounding neutral hydrogen atoms to make ionised hydrogen gas.

When the temperature dropped about 400,000 years after the Universe's birth, the nucleon and electron combined to make neutral hydrogen atoms.

It did not find a sudden decrease in the brightness of the light emitted by neutral hydrogen atoms at any point in that period, suggesting that re-ionisation did not occur suddenly.

Such clouds formed about 400,000 years after the Big Bang, when the cosmos cooled sufficiently to allow charged protons and electrons to bind together to form electrically neutral hydrogen atoms.

But Zaritsky points out that such searches will fail if the hydrogen is ionised — that is, stripped of its single electron — because only neutral hydrogen atoms produce radio waves.

As the first stars flickered on, their ultraviolet light excited neutral hydrogen atoms around them, causing the gas to emit a faint radio signal at 1,420 megahertz.

By approximately 400,000 years after the Big Bang, the universe cooled enough for free electrons and protons to combine into neutral hydrogen atoms that filled the universe, allowing light to travel through the cosmos.

At that time, an obscuring fog of neutral hydrogen atoms was being burned off by radiation from the first stars and galaxies, and possibly also from the annihilation of dark matter particles.

Before first starlight, the universe was dominated by neutral hydrogen atoms.

These neutral hydrogen atoms might also signal the approach of solar storms — gusts in the solar wind that can disrupt satellites, radio communications, and electrical power grids.

Theorists had predicted that about one in 10,000 of the solar wind's protons would snatch an electron from a passing neutral atom to become a neutral hydrogen atom itself.

(Neutral hydrogen atoms can also contain neutrons, but this is a much less common arrangement.)

The majority of the neutral hydrogen atoms found in nature contain a positively charged proton and a negatively charged electron that together bear no net charge (hence, are neutral).

And just as the neutral hydrogen atom is made of a single proton bound to an electron, an atom of antihydrogen comprises an antiproton and a positron, the antimatter counterparts, respectively.

The first stars, however, also began emitting intense ultraviolet radiation that «re-ionized» neutral hydrogen atoms formed after the Big Bang by tearing electrons from their proton nuclei.

By August 3, 2001, the same team of astronomers announced that they were able to use the quasar to mark the end of the period when radiation from the first stars and quasars tore apart and re-ionized the neutral hydrogen atoms that filled the universe for some 100 million years after the Big Bang (SDSS press release).

In 1965, Jim Gunn (SDSS Project Scientist) and Bruce Peterson predicted that neutral hydrogen atoms would be detected by their light - absorbing signature, creating a trough in the spectrum as hydrogen atoms absorb all the light at a particular, characteristic wavelength.