Outer Space

Simulation of material orbiting close to a black hole. (Image: Foto: ESO / Gravity Consortium / L. Calçada)

What Exactly Is a Black Hole?

What is a black hole? In an article that has just appeared in the journal Nature Astronomy, LMU philosopher Erik Curiel shows that physicists use different definitions of the concept, depending on their own particular fields of interest. A black…

Antlia 2 is slightly larger than the Large Magellanic Cloud and is almost 1/3 of the Milky Way itself. (Image: V. Belokurov and A. Smith (Cambridge, UK and CCA, New York, US) based on the images by Marcus and Gail Davies and Robert Gendler)

Gaia Spots a ‘Ghost’ Galaxy

An international team of astronomers, including from the University of Cambridge, discovered the massive object when trawling through data from the European Space Agency’s Gaia satellite. The object, named Antlia 2 (or Ant 2), has avoided detection until now thanks…

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Hubble’s Dazzling Display of 2 Colliding Galaxies

Located in the constellation of Hercules, about 230 million light-years away, NGC 6052 is a pair of colliding galaxies. They were first discovered in 1784 by William Herschel and were originally classified as…

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What Exactly Is a Black Hole?

What is a black hole? In an article that has just appeared in the journal Nature Astronomy, LMU philosopher Erik Curiel shows that physicists use different definitions of the concept,…

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X-ray Pulse Detected Near Event Horizon

On Nov. 22, 2014, astronomers spotted a rare event in the night sky: A supermassive black hole at the center of a galaxy, nearly 300 million light-years from Earth, ripping…

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Citizen Scientists Find New World With NASA Telescope

Using data from NASA’s Kepler space telescope, citizen scientists have discovered a planet roughly twice the size of Earth located within its star’s habitable zone, the range of orbital distances where…

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Gaia Spots a ‘Ghost’ Galaxy

An international team of astronomers, including from the University of Cambridge, discovered the massive object when trawling through data from the European Space Agency’s Gaia satellite. The object, named Antlia…

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Scientists Have Captured the Sound of a Sunrise on Mars

Scientists have created the soundtrack of the 5,000th Mars sunrise captured by the robotic exploration rover Opportunity, using data sonification techniques to create a 2-minute piece of music. Researchers created…

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Mars Moon Got Its Grooves From Rolling Stones

A new study bolsters the idea that strange grooves crisscrossing the surface of the Martian moon Phobos were made by rolling boulders blasted free from an ancient asteroid impact. The…

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All You Need to Know About the Milky Way

For thousands of years, people have been puzzling over the milky strip that extends across the entire firmament. In the modern era, Galileo Galilei discovered that this Milky Way consists…