Understanding the human body is a team effort. That's where the Yachtel group comes in.

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This is Scientific American's 60-second science. I'm Christopher in Taguata.

If you've ever looked up at the Milky Way, you've seen what's known as cosmic dust.

When you see this band, right, of the Milky Way, you can see these dark patches. And so that's

really just dust that is obscuring the stars behind it. Pascal Ush is an associate professor at the University of Geneva.

He points out that cosmic dust isn't exactly the kind of dust you or I might be familiar with.

Cosmic dust is not quite the same as the dust we know from the apartment here.

But it's cosmic dust that are really just very small particles in the universe that are consisting

maybe of just a few molecules, often containing carbon or silicate.

And as in that Milky Way example, the cosmic dust absorbs the light of stars behind it,

making it harder for us to see those stars with instruments like the Hubble Space

telescope. But there is one way around that. Astronomers can observe the sky with longer wavelengths,

using telescopes like the Atacama Large Millimeter Sub-Millimeter Array in Chile, or Alma.

With Alma, astronomers can see even the dust bunnies hiding up in the sky, because as the dust

absorbs photons from the stars behind it, it heats up.

And so then with Alma, we can directly see the emission of this heated up dust, even in the very

early universe.

Erchen's team have now stumbled upon two previously obscured galaxies using Alma observations.

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