Category Astronomy/Space

Artist’s rendering of WISE 0855 as it might appear if viewed up close in infrared light. (Illustration by Joy Pollard, Gemini Observatory/AURA)

Difficult spectroscopic observations reveal properties of the coldest known object outside of our solar system. Since its detection in 2014, the brown dwarf known as WISE 0855 has fascinated astronomers. Only 7.2 light-years from Earth, it is the coldest known object outside of our solar system and is just barely visible at infrared wavelengths with the largest ground-based telescopes.

Now, a team has succeeded in obtaining an infrared spectrum of WISE 0855 using the Gemini North telescope in Hawaii, providing the first details of the object’s composition and chemistry...

Two images show the Perseus cluster of galaxies. The image on the left shows a close up image of active galaxy NGC 1275, the central, dominant member of the Perseus cluster (credit: Data – Hubble Legacy Archive, ESA, NASA; Processing – Al Kelly). The image on the right shows the cluster using an X-ray telescope revealing the atmosphere of plasma enveloping the whole galaxy cluster.

Data from a now-defunct X-ray satellite is providing new insights into the complex tug-of-war between galaxies, the hot plasma that surrounds them, and the giant black holes that lurk in their centres. Launched from Japan on February 17, 2016, the Japanese space agency (JAXA) Hitomi X-ray Observatory functioned for just over a month before contact was lost and the craft disintegrated...

Rice University scientists propose that life in the solar system could have been very different – See more at: http://news.rice.edu/2016/07/05/lush-venus-searing-earth-it-could-have-happened-2/#sthash.pz2Lc0vd.dpuf

Life in the solar system could have been very different. If conditions had been just a little different an eon ago, there might be plentiful life on Venus and none on Earth. The idea isn’t so far-fetched, according to a hypothesis by Rice University scientists who published their thoughts on life-sustaining planets, the planets’ histories and the possibility of finding more...

The preservation of Cretaceous mollusk fossils from Seymour Island is excellent, with shells preserving original mother-of-pearl material as in these two specimens of Eselaevitrigonia regina. Credit: Sierra V. Petersen

A new reconstruction of Antarctic ocean temperatures around the time the dinosaurs disappeared 66 million years ago supports the idea that one of the planet’s biggest mass extinctions was due to the combined effects of volcanic eruptions and an asteroid impact. 2 University of Michigan researchers and a Florida colleague found 2 abrupt warming spikes in ocean temperatures that coincide with two previously documented extinction pulses near the end of the Cretaceous Period...