A mysterious X-ray signal has been found in a detailed study of galaxy clusters using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton. One intriguing possibility is that the X-rays are produced by the decay of sterile neutrinos, a type of particle that has been proposed as a candidate for dark matter. While holding exciting potential, …
On July 1, 2004 at 12:12 a.m. ET—10 years ago—the main engine on board the Cassini space probe cut off. When the burn was over, Cassini had achieved a milestone in human history: It became the first spacecraft to enter Saturn orbit. Click here to read Phil Plait’s article and view these spectacular images.
Our Moon is weird. It’s pretty big compared with Earth, for one. It has a way lower density than Earth, but seems to have some similarities in chemical composition to our planet. It’s also two-faced: The near side looks a lot different than the far side, as you can see from the Lunar Reconnaissance …
Einstein’s Theory of General Relativity predicts that accelerated masses emit gravitational waves, or ripples in space-time. Even though gravitational waves have yet to be detected directly, we expect that there are more than hundred million gravitational wave sources in our own galaxy. However, as of today, we know of only a few such sources. A …
Gemini Reveals a Gravitational Wave Source in Hiding Read More »
