Universe
Extraordinary evidence needed to claim discovery of extraterrestrial life
The detection of life beyond Earth would be one of the most profound discoveries in the history of science. The Milky Way galaxy alone hosts hundreds of millions of potentially habitable planets. Astronomers are using powerful space telescopes to look for molecular indicators of biology in the atmospheres of the most Earth-like of these planets. …
Potential sign of life found on a distant planet and why many are still skeptical
A team of astronomers announced on April 16, 2025, that in the process of studying a planet around another star, they had found evidence for an unexpected atmospheric gas. On Earth, that gas – called dimethyl sulfide – is mostly produced by living organisms. In April 2024, the James Webb Space Telescope stared at the …
James Webb Space Telescope: How to send a giant telescope to space – and why
The James Webb Space Telescope is scheduled to head to space on Dec. 22, 2021. With it, astronomers hope to find the first galaxies to form in the universe, will search for Earthlike atmospheres around other planets, and accomplish many other scientific goals. I am an astronomer and the principal investigator for the Near Infrared …
Three reasons why black holes are the scariest things in the Universe
Halloween is a time to be haunted by ghosts, goblins and ghouls, but nothing in the Universe is scarier than a black hole. Black holes – regions in space where gravity is so strong that nothing can escape – are a hot topic in the news these days. Half of the 2020 Nobel Prize in …
See the first-ever image of a black hole
Until now, everything we’ve known about black holes — celestial objects with intense gravitation — has been from theories and illustrations. Now, thanks to an international collaboration called the Event Horizon Telescope (EHT), a cosmic portrait of a supermassive black hole exists. At the center of the galaxy Messier 87 (M87) in the Virgo constellation, the …
NGC 6357: A cosmic ‘winter’ wonderland
Although there are no seasons in space, this cosmic vista invokes thoughts of a frosty winter landscape. It is, in fact, a region called NGC 6357 where radiation from hot, young stars is energizing the cooler gas in the cloud that surrounds them. This composite image contains X-ray data from NASA’s Chandra X-ray Observatory and …