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Diagram of the Milky Way showing our Sun, the white dwarf, and the gas cloud relative to our neighbor galaxy, the Large Magellanic Cloud (adajcent to it the Small Magellanic Cloud). The white dwarf RX J0439.8-6809 and the gas cloud are between us and the Large Magellanic Cloud. Image: Philipp Richter/University of Potsdam

The Hottest White Dwarf In The Galaxy

Astronomers at the Universities of Tübingen and Potsdam have identified the hottest white dwarf ever discovered in our Galaxy. With a temperature of 250,000 degrees Celsius, this dying star at the outskirts of the Milky…

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Dwarf galaxies have few stars but lots of dark matter. This Caltech FIRE (Feedback in Realistic Environments) simulation from shows the predicted distribution of stars (left) and dark matter (right) around a galaxy like the Milky Way. The red circle shows a dwarf galaxy like Triangulum II. Although it has a lot of dark matter, it has very few stars. Dark matter-dominated galaxies like Triangulum II are excellent prospects for detecting the gamma-ray signal from dark matter self-annihilation. Credit: A. Wetzel and P. Hopkins, Caltech

Dark Matter Dominates In Nearby Dwarf Galaxy

Dark matter is called “dark” for a good reason. Although they outnumber particles of regular matter by more than a factor of 10, particles of dark matter are elusive. Their existence is inferred by their…

A very small faceted basalt wedge. Basalt is a local material. This tool, also found at MVI, was made 15,000-16,000 years ago. It would have been used for woodworking. Credit: Courtesy Tom Dillehay

New Clues Emerge About Earliest Known Americans

Stone tools, cooked animal and plant remains and fire pits found at the Monte Verde site in southern Chile provide greater interdisciplinary evidence that the earliest known Americans–a nomadic people adapted to a cold, ice-age…

Day 233. Once upon a #star over Southern India. #GoodNight from @space_station! #YearInSpace— Scott Kelly (@StationCDRKelly) November 15, 2015

Astronaut Tweets ‘UFO’ Picture?

For the past year, astronaut Scott Kelly has been tweeting breathtaking photos of Earth from the International Space Station. On Sunday, he may have tweeted a photo of something far more astounding — a UFO….