- What process makes the 21 cm radiation of hydrogen?
- Why is the 21 cm line of hydrogen useful?
- Why is 21 cm radiation important quizlet?
- Why do astronomers not detect 21 cm radiation from the hydrogen in giant molecular clouds?
- What is 21-cm radiation and why is it useful to astronomers?
- What happens if you go inside a nebula?
- What did nebula look like before Thanos?
- What does a nebula look like to the human eye?
- Is a galaxy bigger than a nebula?
What process makes the 21 cm radiation of hydrogen?
The hydrogen line, 21-centimeter line, or H I line is the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms.
Why is the 21 cm line of hydrogen useful?
The hydrogen in our galaxy has been mapped by the observation of the 21-cm wavelength line of hydrogen gas. At 1420 MHz, this radiation from hydrogen penetrates the dust clouds and gives us a more complete map of the hydrogen than that of the stars themselves since their visible light won’t penetrate the dust clouds.
Why is 21 cm radiation important quizlet?
21-cm radiation is important because: it allows us to study the deep interiors of stars. it allows us to image magnetic fields directly. it allows us to study neutral hydrogen in the interstellar medium.
Why do astronomers not detect 21 cm radiation from the hydrogen in giant molecular clouds?
Why don’t astronomers detect 21-cm radiation from the hydrogen in giant molecular clouds? Because the clouds are moving along our line of sight at different speeds relative to Earth’s, and so their Doppler shifts are either slightly different or undetectable.
What is 21-cm radiation and why is it useful to astronomers?
Why is it useful for studying the interstellar medium? With its long wavelength, the 21-cm radiation can easily pass through dust clouds without being scattered. Therefore we can detect clouds of cold hydrogen gas throughout the Galaxy, and determine their temperature and density.
What happens if you go inside a nebula?
A nebula is gas, yes gas floating in space. And this gas (given enough time) will crumble because of, you know, gravity, forming a star or other things. Now passing through a nebula is like walking through air, nothing happens.
What did nebula look like before Thanos?
Her first appearance was in Avengers #257 in 1985, and she looked very different than how most Marvel fans think of her now. Instead of her bald head and metal plates, Nebula had long hair and smooth skin. She hadn’t yet undergone most of the cybernetic enhancements that she has in the comics (and the movies).
What does a nebula look like to the human eye?
What this means is that if you can see any nebula with the naked eye, that’s about how bright it would look up close. If you look at something like the Orion Nebula through a telescope, it also just looks like a faint grey-white cloudiness that is only visible under decently dim lighting conditions.
Is a galaxy bigger than a nebula?
Simply put, the main difference between galaxies and nebulae are an extreme difference in size, as well as their basic structure. A nebula is a cloud of dust and gas, usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across.