Support for NPR and the following message come from Yarl and Pamela Mohn, thanking the people who make public radio great every day and also those who listen.

You're listening to Shortwave from NPR.

Hey, shortwavers, Burley McCoy here.

And Emily Kwong with our biweekly Science News Roundup featuring the hosts of

all things considered. And today we have Scott Detrow. I'm only here because I heard we were talking

about a hot galaxy cluster. That's how we get you in the door. Yeah. But how we're going to keep you is

talking about also how elephants' trunks lead them to food. And we'll share a big discovery in

butterfly migration. I'm here for all three. Well, we thank you. All that on this episode

of Shortwave, the science podcast from NPR.

Support for NPR, and the following message come from Yarl and Pamela Mohn, thanking the people who make public radio great every day and also those who listen.

Okay, Scott, I know your favorite thing is space, so let's start there.

Let's start there.

Wow.

Let's start up. What would you say a galaxy cluster is, though. Let's start there. Wow. Let's start up. What would you say a galaxy

cluster is, though? Let's start there. It is exactly what it sounds like. It is a collection of galaxies,

but kind of like a city where each galaxy is a different building. Our galaxy, the Milky Way,

is part of a cluster called the local group, for example. But the galaxy cluster we want to talk about,

which is the subject of a new paper in nature, was formed about 12 billion years ago. And the universe

itself is only about 13.8 billion years old. So that's just a fast billion years, like a snap of

the fingers in galaxy terms. Like we were talking about this, this was a baby

in galactic here. Exactly. And current theories say that younger galaxy clusters should be relatively

cool. But this one is very hot, like hotter than the surface of the sun. We talked to Jorge

...