New comet to sweep past Earth: How and when to see it

Stargazers should catch a glimpse of the comet as soon as possible — it will be another 400 years before it returns.

NASA releases first images from pollution-monitoring satellite in space

NASA has shared this week the first images from TEMPO, the agency’s first space-based instrument designed to continuously measure air quality over North America, and do so with the resolution of a few square miles.

VIDEO: 3-legged bear breaks into Florida home's lanai, drinks 3 White Claws | 'Oh my God, look at him!'

A Lake Mary, Florida, mother received the shock of her life when she discovered that a three-legged black bear, affectionately known as Tripod, had somehow managed to break into her home while her 13-year-old son was inside with the family dog. The woman said the bear even accessed her outdoor refrigerator and helped itself to three of her White Claws.

WATCH: Crew-6 astronauts splash down off Florida coast after wrapping up 6-month mission at ISS

Four Crew-6 astronauts returned to Earth early Monday after a six-month stay at the International Space Station. Their SpaceX capsule parachuted into the Atlantic off the Florida coast.

India's moon rover completes walk, scientists to analyze data for signs of frozen water

India’s space mission says the moon rover has completed its walk on the lunar surface and been put into sleep mode less than two weeks after its historic landing near the lunar south pole.

Pentagon to release declassified UFO photos, videos and reports on new website

The Pentagon on Thursday announced the launch of a new website with the All-domain Anomaly Resolution Office (AARO), which will provide the public with declassified information about UFOs, or what the government calls unidentified anomalous phenomena (UAPs).

Rare super blue moon spectacle treats stargazers worldwide to stunning scenes

The stunning astronomical phenomenon created an awe-inspiring setting that took center stage from the Pyramids of Giza in Egypt, towering skyscrapers in Madrid and serene open fields of America's heartland.

Montana men surprise momma bear with cub, encounter ends with accidental shooting

The men from Whitefish were scouting for hunting season in the woods near the Smokey Range Trailhead in the Flathead National Forest on Saturday when they encountered the full-grown grizzly and her cub.

Rare blue supermoon to appear this week: What to know

NASA says a Blue Moon refers not to its color but to any month with two full moons in the 29.5-day lunar cycle.

Rare river otter attacks near Lake Tahoe

Outdoors enthusiasts are being warned to be aware of their surroundings after two recent river otter attacks near Lake Tahoe.

NASA's most multinational space crew rockets to the ISS

A NASA astronaut was joined on the predawn liftoff from Kennedy Space Center by fliers from Denmark, Japan and Russia. They clasped one another's gloved hands upon reaching orbit.

Stunning video: Rare 'Octopus Garden' discovered off California coast

Scientists in California and beyond have discovered an "Octopus Garden" of up to 20,000 eight-armed creatures living in the deep sea about 80 miles southwest of Monterey. 

India becomes fourth country to land on the moon, first near the south pole

India’s successful moon landing comes just days after Russia’s Luna-25, which was aiming for the same lunar region, spun into an uncontrolled orbit and crashed.

Mountain lion spotted in San Mateo backyard, 2nd big cat sighting since Friday

A bobcat was spotted in San Mateo Sunday evening. This is the second confirmed big cat sighting in the Peninsula city since Friday, according to police.

Is Hilary a harbinger of climate change to come?

Hilary was the first tropical storm to hit California in more than 80 years, but climate scientists expect them to become more common.

Bobcat, mountain lion sightings on Peninsula

A bobcat was spotted walking around residential San Mateo this weekend, a few days after mountain lion sightings.