Nuclear fusion is what separates stars from planets. Stars are massive enough to fuse hydrogen in their cores, while planets are not. But in between these two categories are brown dwarfs, which are massive enough to experience some nuclear fusion, just not hydrogen. The largest of them are hot and star-like. The smallest of them are barely warm enough to bake a pizza.
Space News & Blog Articles
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'Ghost stars' haunt the center of the Milky Way galaxy. Now we know why
The galactic bulge at the heart of the Milky Way is haunted by the ghosts of dead stars spread out as a mysterious arrangement of planetary nebulas.
James Webb Space Telescope stars in new Netflix documentary 'Unknown: Cosmic Time Machine' (exclusive trailer)
An exclusive look at the new trailer for Netflix's documentary, "Unknown: Cosmic Time Machine"
A Global Call for Innovation and Research: Humans In Space Challenge Seeks Startups and Researchers to Pioneer Human Life Beyond Earth
Applications for this exceptional competition are open until July 28 (11:59 PM US ET). Don't miss out on this incredible opportunity to be a part of the Humans In Space (HIS) Challenge, initiated by Boryung Corp
Watch SpaceX launch 15 Starlink satellites to orbit early Wednesday
A SpaceX Falcon 9 rocket will launch 15 Starlink satellites to orbit early Wednesday (July 19), and you can watch the action live.
Five sci-fi cartoons to watch while you wait for the Futurama revival
Good news everyone, we've found some great sci-fi shows for you to watch while you wait for the new season of Futurama.
What's it like to have an asteroid named after you? Our night sky columnist Joe Rao explains
Space.com's night sky columnist Joe Rao explains what it was like to have asteroid 200009 Joerao named after him for his many years of astronomy outreach with the general public.
Indian Ocean gravity hole was caused by extinct ancient sea, scientists say
Scientists have puzzled over the origins of a gravity hole in the Indian Ocean for years. Now, researchers think the sunken floor of an extinct ocean could be the cause.
Nuclear bombs set off new geological epoch in the 1950s, scientists say
Nuclear testing in the 1950s marked sediments at the bottom of a lake in Canada to such an extent that scientists are calling for it to become the symbol of a new geological epoch: the Anthropocene.
New strategy to keep pace with our changing world
Fuelled largely by climate change, our planet is being subjected to environmental changes that are having an unprecedented global impact on humans, animals and plants. Shockingly, in certain locations these changes are occurring at a rate never before witnessed.
World's biggest radio telescope could tease out secrets of dark matter, universe's 1st galaxies
The coming Square Kilometre Array could shed light on mysterious dark matter, revealing the role it played in the formation of the universe's first galaxies.
Watch 1 month in the life of a green comet during its journey past Earth (video)
Comet C/2022 E3 made a close pass by our planet in January, and a new video captures its incredible journey in 4K resolution.
NASA Artemis DIMPLE Instrument Suite to Explore Moon’s Mysterious Volcanic Features
NASA recently selected a new science payload that will travel to the Moon through a series of robotic missions via the agency’s Artemis program. This instrument suite, known as the Dating an Irregular Mare Patch with a Lunar Explorer (DIMPLE), will have the task of studying the Ina Irregular Mare Patch, also known as Ina, which is a small depression that could provide insights into the Moon’s volcanic history. It was discovered using orbital images from the Apollo 15 crew, and despite several past studies, its origin remains unclear.
Celebronauts race to plug holes in the hab on Fox's 'Stars on Mars' (exclusive clip)
See an exclusive clip from Episode 6 of Fox's summer sci-fi reality TV show, 'Stars on Mars,' which is hosted by William Shatner.
Live Coverage: Rocket Lab to launch seven satellites, recover Electron booster at sea
Live coverage of the countdown and launch of a Rocket Lab Electron rocket from Launch Complex 1B on Mahia Peninsula in New Zealand with seven small satellites. Text updates will appear automatically below. Follow us on Threads.
'Cannibal' coronal mass ejection that devoured 'dark eruption' from sun will smash into Earth on July 18
Two coronal mass ejections have combined into an enormous cloud of magnetized plasma that is forecast to hit Earth on Tuesday and potentially trigger a strong geomagnetic storm.
Pulsars
Pulsars are highly compact and rapidly rotating neutron stars that emit beams of electromagnetic radiation. Here are some key points about pulsars:
'Foundation' stars Lee Pace and Laura Birn discuss Season 2's riddles and romance (exclusive)
An interview with Lee Pace and Laura Birn about Season 2 of Apple TV+'s 'Foundation.'
Russia's Luna-25 moon lander reaches launch site for August 11 liftoff
Luna-25, the first spacecraft from modern Russia to head for the moon, has arrived at Vostochny Cosmodrome in the country's far east ahead of a planned August 11 launch.
Australian Space Agency investigating possible rocket debris found on beach
The Australian Space Agency found a piece of debris that may be part of a 'foreign space launch vehicle,' but it's unclear which one it could be.
