All Episodes

August 24, 2021 29 min
How did the planets form? How did life happen? Where did Earth’s water come from? To answer questions like these, scientists used to go big—looking at planets, dwarf planets, and moons—but now small is the new big. Technology is zooming in on the pint-size stuff—asteroids, comets, meteors, and other chunks of space rock—that couldn’t be studied before, and Lucy, a spacecraft designed to visit eight asteroids near Jupiter, is poised to learn how the secrets inside these small bodies are reshaping ideas about the big old solar system. For more information on this episode, visit natgeo.com/overheard Want more?
 How do you recover a sample from an asteroid? Send a spacecraft equipped with something akin to a Roomba at the end of a 10-foot pogo stick. Bennu's orbit brings it close to Earth. Now we have a precise calculation of the odds that—gulp—it will collide with us Coming soon from NASA: a demonstration to test whether we could avert an oncoming asteroid. Also explore: In the early 1800s, astronomers wanted to find a missing planet. Instead, as our video series Nat Geo Explores shows us, they discovered the asteroid belt.  For the first time, scientists are studying interstellar interlopers—asteroids and comets visiting us from another star system. The solar system has always been a violent place. But Earth’s recent history suggests a rising tide of celestial impacts, according to one study. And for paid subscribers: Michael Greshko’s National Geographic cover story explains how the study of small objects is rewriting what astronomers know about the solar system. If you like what you hear and want to support more content like this, please consider a National Geographic subscription. Go to natgeo.com/explore to subscribe today.
Share
Mark as Played

Advertise With Us

Popular Podcasts

Crime Junkie
Bob Saget's Here For You

Bob Saget's Here For You

BOB SAGET’S HERE FOR YOU is a podcast that is like no other— For one, this podcast has guests who are friends of Bob’s, or just really interesting people who many of you know and love. Secondly, this podcast is unique because it goes inside Bob Saget’s mind, and then quickly filters out through his mouth. Bob has a way of calming people he has conversations with as well as being entertaining and often informative. Bob talks with his guests with genuine empathy and humor, while reaching his unusually diverse audience that he talks to as a friend, Bob is the dad with great advice, the irreverent funny guy who’s always there when you need a laugh, and the free-associative Bob who goes off on crazy tangents then returns to the subject at hand, as serious or as comedic as it may be, to wrap up each episode in a way only Bob can do. Because he really does believe, “He’s here for you."

Dateline NBC

Dateline NBC

Current and classic episodes, featuring compelling true-crime mysteries, powerful documentaries and in-depth investigations.

For You

    Music, radio and podcasts, all free. Listen online or download the iHeart App.

    Connect

    © 2022 iHeartMedia, Inc.

    • Help
    • Privacy Policy
    • Terms of Use
    • AdChoicesAd Choices