You're listening to NASA's Curious Universe.

I'm your host, Patty Boyd.

And I'm your host, Jacob Pinter.

This is the fifth and final episode of our Earth series.

If you miss the other stories, no worries.

You can listen in any order.

Just know that there are even more wild and wonderful adventures waiting for you all about how NASA explores our home planet.

We've unpacked missions that study the ocean, which is so big that you need to see the full picture from space.

We've heard about NASA's agriculture program, which puts information into the hands of people who need it. And because

air pollution is the world's number one cause of premature mortality, we've heard how NASA measures

air quality and studies the atmosphere we live in. Just scroll back in your podcast feed. You'll find

those stories and many, many more. NASA Earth science has a long history.

A major milestone happened back in the 1960s,

when the first astronauts to orbit the moon saw our home planet from a distance.

It was breathtaking,

and it led to an iconic photo called Earthrise.

Oh, my God, look at that picture over there.

There's the Earth coming up.

Wow, is that pretty?

From space, astronauts saw the Earth as one interconnected system.

Just a few years after the Apollo missions,

Earth's One, the first experimental Earth satellite,

...