Astronomers have found the most distant gravitational lens yet - a galaxy that, as predicted by Albert Einstein's general theory of relativity, deflects and intensifies the light of an even more distant object. The discovery provides a rare opportunity to directly measure the mass of a distant galaxy.
Earth's most eminent emissary to Mars has just proven that those rare Martian visitors that sometimes drop in on Earth -- a.k.a. Martian meteorites -- really are from the Red Planet. A key new measurement of Mars' atmosphere by NASA's Curiosity rover provides the most definitive evidence yet of the origins of Mars meteorites while at the same time providing a way to rule out Martian origins of other meteorites.
A team of researchers, including two Carnegie scientists, used a novel astronomical survey software system - the intermediate Palomar Transient Factory - to link a new stripped-envelope supernova, named iPTF13bvn, to the star from which it exploded, which is a first for this type of supernova, called Type Ib. The iPTF team also pinpointed the first afterglow of an explosion called a gamma-ray burst that was found by the Fermi satellite.
A team led by astronomers from Chalmers and Onsala Space Observatory have used the powerful telescope Alma to catch an unexpected glimpse of an extreme place in space: the base of a powerful jet close to a distant, hungry black hole.
An international team of astronomers has observed part of the final death throes of the largest known star in the Universe as it throws off its outer layers. The discovery, by a collaboration of scientists from the UK, Chile, Germany and the USA, is a vital step in understanding how massive stars return enriched material to the interstellar medium which is necessary for forming planetary systems.
Scientists found evidence that magnetic waves in a polar coronal hole contain enough energy to heat the corona and moreover that they also deposit most of their energy at sufficiently low heights for the heat to spread throughout the corona. The observations help to answer a 70-year-old solar physics conundrum about the unexplained extreme temperature of the Sun's corona - known as the coronal heating problem.
Astronomers have found the shattered remains of an asteroid that contained huge amounts of water orbiting an exhausted star, or white dwarf. This suggests that the star GD 61 and its planetary system - located about 150 light years away and at the end of its life - had the potential to contain Earth-like exoplanets, they say.
The beautiful, petal-like shells of galaxy PGC 6240 are captured in intricate detail by the NASA/ESA Hubble Space Telescope, set against a sky full of distant background galaxies. This cosmic bloom is of great interest to astronomers due to both its uneven structure, and the unusual clusters of stars that orbit around it - two strong indications of a galactic merger in the recent past.