By its very nature, spaceflight is very challenging and very wasteful. As Tsiolkovsky's famous Rocket Equation establishes, propellant accounts for the majority of a rocket's mass, which is burned off during launch. The process also introduces large amounts of greenhouse gases, such as carbon dioxide, water vapor, and black carbon, as well as ozone-depleting chemicals, into the upper atmosphere. On top of that, the disposal process for satellites once they are no longer operational (deorbiting and burning up in the atmosphere) is also wasteful, with no materials retrieved or reused.
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The Subaru Telescope just made its 1st discoveries: a 'failed star' and an exoplanet
Check out the first findings from the Subaru Telescope.
SpaceX launches Starlink satellites on record 32nd flight of Falcon 9 rocket (video)
A SpaceX Falcon 9 rocket carrying 29 Starlink satellites lifted off from NASA's Kennedy Space Center in Florida on Monday, Dec. 8, 2025. It was the record 32nd flight of the Falcon's first stage.
One of the most promising Earth-like worlds may not have an atmosphere after all
New simulations suggest TRAPPIST-1e's possible methane atmosphere may be a false signal from its star, raising fresh questions about the planet’s habitability.
Get Ready for the Geminids
It’s December and that means one of the best celestial events will grace the skies. The Geminid meteor shower should peak between Saturday night and Sunday morning, December 13–14.
It's the JWST's Turn To Look For An Intermediate Mass Black Hole
Intermediate mass black holes (IMBH), if they exist, have between about 100 and 1000 solar masses, placing them in between stellar black holes and supermassive black holes. But while there's plenty of evidence for both stellar mass black holes and supermassive black holes, the evidence for IMBHs isn't as convincing. There are many candidates, but there's no wide agreement on any of them. Yet our theories of black holes show there should be something in between stellar black holes and supermassive black holes, and IMBHs could be the missing link.
5 Terminator games that are actually good
Ahead of Terminator 2D: NO FATE, we're going back in time to find some Terminator games that don't suck. Don't worry, we'll be back!
Scientists discover cosmic 'scar' in interstellar clouds left by a close shave between our sun and 2 intruder stars
"It’s kind of a jigsaw puzzle where all the different pieces are moving."
The Milky Way's Supermassive Black Hole Isn't As Destructive As Thought.
The center of the Milky Way is an extreme environment dominated by the supermassive black hole (SMBH) Sagittarius A star (Sgr A-star). Sgr A-star has about 4 million solar masses, and its powerful gravity and radiation defines the region. Its gravity accelerates the orbits of stars and gas clouds in its vicinity. Radiation from the SMBH's accretion processes, from the stellar winds coming from colliding stars, from abundant supernovae explosions, and from superheated gas falling toward the black hole, saturates the region.
Which exoplanet in the TRAPPIST-1 system could be habitable? Scientists are modeling the star to find out
Frequent flares from the nearby star TRAPPIST-1 could offer new clues in the search for habitable planets beyond Earth.
Watch live: US Senate vote to appoint Jared Isaacman as head of NASA today
The U.S. Senate will hold its second hearing to consider billionaire tech entrepreneur Jared Isaacman's nomination for NASA chief on Wednesday (Dec. 3), and you can watch the action live.
What supermoon am I? A lunar personality test
The supermoon shines brighter and bolder than usual—discover which dazzling lunar personality matches you.
Northern lights may be visible in 17 states (and maybe more) tonight
Auroras may be visible from Alaska to Illinois as an incoming coronal mass ejection is expected to slam into Earth.
Uranus's small moons are dark, red, and water-poor
…Except for Mab, which is even weirder than expected.
5 key takeaways from Jared Isaacman's 2nd NASA chief nomination hearing
Private billionaire SpaceX astronaut Jared Isaacman appeared before a Senate committee Dec. 3 for consideration as NASA administrator. Here are 5 big takeaways from the hearing.
A green flash at sunset | Space photo of the day for Dec. 8, 2025
This rare phenomenon is also called the green rim and it actually happens at every sunset.
NASA spacecraft were vulnerable to hacking for 3 years and nobody knew. AI found and fixed the flaw in 4 days
An AI start-up has found a vulnerability in security software protecting NASA's ground control communications with satellites in space.
Sun unleashes intense X-class solar flare, triggering radio blackouts across Australia
The powerful X1.1 solar flare from sunspot region 4298 sparked strong radio blackouts on the sunlit portion of Earth at the time of eruption.
The Primordial Black Hole Saga: Part 1 - The Dark Matter Mystery
(This is Part 1 of a series on primordial black holes!)
Inspired by Schools of Fish, This Magnetic Material Swarms to Eat Carbon Dioxide
Removing, or “scrubbing”, carbon dioxide from the air of confined spaces is a critical component of any life support system on a spacecraft or submarine. However, modern day ones are energy intensive, requiring temperatures of up to 200℃ to operate. So a research lab led by Dr. Hui He at Guangxi University in China has developed what they call “micro/nano reconfigurable robots” (MNRM) to scrub CO2 from the air much more efficiently. Their work is described in a new paper in Nano-Micro Letters.
Watch 3 astronauts head home to Earth from the International Space Station tonight
NASA's Jonny Kim and two cosmonauts are scheduled to leave the International Space Station tonight (Dec. 8), and you can watch their homecoming live.
