#James Webb Space Telescope

#James Webb Space Telescope

Hubble captured the planet's reflected visible light and highlighted Saturn's iconic yellow hues, which are, in part, a product of the sunlight-reflecting ammonia crystals and hydrocarbons such as methane in its atmosphere.

Discovered in December 2024, asteroid 2024 YR4 was briefly considered the most dangerous asteroid in decades after scientists initially estimated it had a 3.1% chance of colliding with the Earth in 2032. Closer observations quickly ruled out a city killer scenario, but instead astronomers calculated there was a 4.3% chance that the moon lay in the path of impact.

Soon after it was spotted in December 2024, worldwide telescopic observations quickly positioned it as the most dangerous space rock ever discovered—one that stood a 3.1-percent (or 1-in-32) chance of crashing into Earth on December 22, 2032. If it were to hit one of the cities potentially in its path, this 60-meter asteroid would have unleashed a force comparable to several atomic bombs, devastating the unfortunate metropolis.

This particular exoplanet quickly captured astronomers' attention with its extreme variations in brightness. Most objects in space appear to blink, due either to physical changes within the planet or star, or external factors. For super-Jupiter exoplanets, Zhang said, this change in brightness is usually minimal, hovering at 1 to 2%. But on VHS 1256b, brightness variations neared 40%, the largest ever recorded for an object of its size.

Getting your Trinity Audio player ready... Today is Thursday, Dec. 25, the 359th day of 2025. There are six days left in the year. This is Christmas Day. Today in history: On Dec. 25, 2009, passengers aboard Northwest Airlines Flight 253 foiled an attempt to blow up the plane as it was landing in Detroit by seizing Umar Farouk Abdulmutallab (OO'-mahr fah-ROOK' ahb-DOOL'-moo-TAH'-lahb), who tried to set off explosives in his underwear. (Abdulmutallab later pleaded guilty and was sentenced to life in prison.)

ESA / Webb, NASA & CSA, G. Mahler Day 7 of the 2025 Space Telescope Advent Calendar: A Warped View Through an Einstein Ring. You are seeing two galaxies here, one in front of the other. The more distant spiral galaxy appears warped and distorted due to the gravitational lensing occurring around a massive, much closer galaxy, which is part of galaxy cluster SMACSJ0028.2-7537.

Day 4 of the 2025 Space Telescope Advent Calendar: Star Birth in the Lobster Nebula. NASA's James Webb Space Telescope recently imaged a region where the radiation and winds from a group of superhot infant stars are blasting and sculpting dense clouds of surrounding dust.

For the first time, scientists have directly detected molecules in a Frisbee of gas and dust swirling around an alien gas-giant planet. I didn't think this was possible, says astronomer Sierra Grant of Carnegie Science in Washington, D.C. Typically such a faint signal would be invisible in the glare of a star. Grant and her co-author Gabriele Cugno of the University of Zurich, who published the results recently in the Astrophysical Journal Letters, think the carbon-rich disk is a lunar nursery.

"To find the holes the third star has cut like a knife through the dust, look for the central point of light and trace a V shape from about 10 o'clock to 2 o'clock," NASA says.

Astronomers say NASA's James Webb Space Telescope may have spotted the universe's first "dark stars," primordial bodies of hydrogen and helium that bear almost no resemblance to the nuclear fusion-powered stars we've come to know.

Astronomers were astonished to find an abundance of phosphine, a molecule produced by microbes on Earth, in the atmosphere of a brown dwarf, an unusual type of object that lives in the grey zone between a giant planet and a tiny star. As detailed in a new paper published in the journal Science, astronomers said they had found "undepleted phosphine," a molecule made up of three hydrogen atoms and one phosphorus atom, in the atmosphere of Wolf 1130C, a brown dwarf 54 light-years from Earth.

To back up his far-fetched theory, Loeb has pointed out that 3I/ATLAS' highly unusual trajectory brings it suspiciously close to Jupiter, Mars, and Venus. In a new blog post, the astronomer pointed out that the object will come within just 1.67 million miles of Mars' path around the Sun, in what he characterized as a "remarkable fine-tuning" of the object's path.

Everything is unusual about this galaxy. Not only does it look very strange, but it also has this supermassive black hole that's pulling a lot of material in.

In April, scientists announced that they had used NASA's James Webb Space Telescope to find a potential signature of alien life in the glow of a distant planet.