Astronomers are announcing today the discovery of two unusual objects in comet-like orbits that originate in the Oort cloud but with almost no activity, giving scientists a first look at their surfaces. These results are particularly intriguing because the surfaces are different from what astronomers expected.
Nestled among a triplet of young galaxies more than 12.5 billion light-years away is a cosmic powerhouse: a galaxy that is producing stars nearly 1,000 times faster than our own Milky Way. This energetic starburst galaxy, known as AzTEC-3, together with its gang of calmer galaxies may represent the best evidence yet that large galaxies grow from the merger of smaller ones in the early Universe, a process known as hierarchical merging.
Observations with the ATCA and ALMA radio telescopes have shown signs of something never seen before, located at the center or the remnant of a supernova. It could be a pulsar wind nebula, driven by the spinning neutron star, or pulsar, which astronomers have been searching for since 1987.
Light pollution is not only a problem for astronomy. Scientists from the interdisciplinary project 'Loss of the Night' study how it affects health, society, and the environment. In order to measure how skyglow is changing, they have developed an app for smartphones, which allows citizen scientists to count the number of visible stars in the night sky.
A sounding rocket experiment has detected a surprising surplus of infrared light in the dark space between galaxies, a diffuse cosmic glow as bright as all known galaxies combined. The glow is thought to be from orphaned stars flung out of galaxies.
Astronomers using the Hubble Space Telescope have completed the largest and most sensitive visible-light imaging survey of dusty debris disks around other stars. These dusty disks, likely created by collisions between leftover objects from planet formation, were imaged around stars as young as 10 million years old and as mature as more than 1 billion years old.
Two astrophysicists argue that questions about the future of life on Earth and beyond may soon be resolvable scientifically, thanks to new data about the Earth and about other planets in our galaxy, and by combining the earth-based science of sustainability with the space-oriented field of astrobiology.
For ALMA's first observations in its new and most powerful mode, researchers pointed the antennas at HL Tauri - a young star, about 450 light-years away, which is surrounded by a dusty disc. The resulting image exceeds all expectations and reveals unexpectedly fine detail in the disc of material left over from star birth.
Instead of WIMPS or axions, dark matter may be made of macroscopic objects as small as a few ounces up to the size of a good asteroid, and probably as dense as a neutron star or the nucleus of an atom.
Collisions of heavenly bodies generate almost unimaginable levels of energy. Researchers at Brown University used NASA's ultra-high-speed cannon and computer models to simulate such a collision on Vesta, the second-largest object in the asteroid belt. Their analysis of the images - taken at a million frames per second - shows how Vesta may have gotten the deep grooves that encircle its midsection.
The mystery about a thin, bizarre object in the center of the Milky Way that some astronomers believe to be a hydrogen gas cloud headed toward our galaxy's enormous black hole has been solved by UCLA astronomers.