General Articles

NuSTAR helps solve riddle of black hole spin

This artist's concept illustrates a supermassive black hole with millions to billions times the mass of our Sun. Supermassive black holes are enormously dense objects buried at the hearts of galaxies. // NASA/JPL-Caltech The findings resolve a long-standing debate about similar measurements in other black holes and will lead to a better understanding of how …

NuSTAR helps solve riddle of black hole spin Read More »

'Methuselah' Star Looks Older Than the Universe

This Digitized Sky Survey image shows the oldest star with a well-determined age in our galaxy. Called the Methuselah star, HD 140283 is 190.1 light-years away. Astronomers refined the star's age to about 14.5 billion years. Digitized Sky Survey (DSS), STScI/AURA, Palomar/Caltech, and UKSTU/AAO by Mike Wall, Space.com The oldest known star appears to be …

'Methuselah' Star Looks Older Than the Universe Read More »

Eerily Blank Sun

Something unexpected is happening on the Sun. 2013 was supposed to be the year of "solar maximum," the peak of the 11-year sunspot cycle. Yet 2013 has arrived and solar activity is relatively low. Sunspot numbers are well below their values from 2011, and strong solar flares have been infrequent. The image above shows the …

Eerily Blank Sun Read More »

More than 500 hurt in meteorite shower

February 15 2013 at 01:34pm By Natalia Shurmina and Andrey Kuzmin REUTERS Chelyabinsk - More than 500 people were injured when a meteorite shot across the sky and exploded over central Russia on Friday, sending fireballs crashing to Earth, shattering windows and damaging buildings. People heading to work in Chelyabinsk heard what sounded like an …

More than 500 hurt in meteorite shower Read More »