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

Here on Earth, your best bet for seeing lava is to go to a volcano.

But out in space, there are entire exoplanets made of the stuff.

These so-called lava worlds orbit so close to their stars that their surface temperatures can melt rock.

Which might sound familiar, says space technologist Mikhail Paiusolo, of the University of Tartu

in Estonia.

So like, for example, from science fictions we know from Star Wars, episode 3, Mustafa Planet.

Kind of like that, but, you know, without the lightsabers.

Scientists had noticed that some of these real lava worlds were extraordinarily bright and reflective, but why?

There was a idea that maybe this comes from the fact that lava itself is basically a liquid

and a smooth surface can reflect, like the surface of water, for example.

So Paiuselow and his colleagues did what anyone would do to test that idea.

They made their own lava.

Here's MIT's Zara Essek, who led the team.

When we remove the lava from the furnace, you could instantly feel the heat wash over you.

Even from six feet away,

it felt like you were standing right on the edge of a roaring bonfire. The crucible, which was

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