absorption lines

So helium was first discovered on the sun before it was later discovered on Earth by looking at the absorption lines of the solar spectrum.

And here you see the spectrum of the sun with all these absorption lines that I mentioned to you.

So far we have identified just one potentially serious source of bias. It concerns the absorption lines produced by the element magnesium.

And as the donor moves around the center of mass, these absorption lines move back and forth.

The team detected three spectral features called absorption lines that together are a definitive signature of methane.

As light from a quasar travels through space, it passes through clouds of gas that imprint absorption lines onto its spectrum.

It's plastered with absorption lines, and each of them can be identified.

And if you place a cool gas in front of a hot source, you will see certain patterns which we call absorption lines.

In fact, if you see the absorption lines, you can tell what kind of elements are present in the star.

Some are very characteristic absorption lines: some for hydrogen, some for calcium, some for silicon, some for magnesium and so on.

And if we want to get these big, deep absorption lines happening far away, we need to have dense, collapsed clouds of gas.

It shows you emission lines, no absorption lines.

It is particularly important to study the absorption lines of quasar.