Antarctica is one of the best places on Earth to spot these fallen stars.
Each winter â€” which is summer in down south â€” a team of geologists camps out on an Antarctic glacier in the middle of nowhere, often where no human has ever tread. It's kind of like a space voyage, but a lot cheaper.
And it's the meteorite that's done most of the traveling.
The Endangered Species Act, which turns 40 on Saturday, helped bring back iconic species such as the wolf, grizzly bear and bald eagle, after hunting, trapping and pesticides almost wiped those animals out.
But a very different kind of threat â€” global warming â€” is pushing some species like the polar bear to the brink of extinction.
One government biologist discovered the best way he could help save polar bears was to quit his job.
Thirty-four wildland firefighters died in the line of duty this year. Some of those fatalities were isolated incidents, but one event captured the nation's attention, sparking a larger conversation about the new dangers firefighters face.
That event unfolded in central Arizona the afternoon of June 30, a Sunday.
"I'm here with Granite Mountain Hot Shots. Our escape route has been cut off," says a crew boss on recently released radio traffic from the Yarnell Hill Fire. "We are preparing a deployment site, and I'll give you a call when we are under the shelters.