Institute of Astronomy

Astronomy News

Astronomy: Black-hole disk launches jet

14 April 2016 - 9:20am

Astronomy: Black-hole disk launches jet

Nature 532, 7598 (2016). doi:10.1038/532150d

Scientists have caught one of the best glimpses yet of a jet of plasma streaming from the black hole at the heart of a distant galaxy.Intense magnetic fields around black holes are thought to launch these beams, which travel nearly at the speed of

Astrochemistry: Sugars made in simulated space

14 April 2016 - 9:20am

Astrochemistry: Sugars made in simulated space

Nature 532, 7598 (2016). doi:10.1038/532151b

A key sugar found in DNA has been created in the laboratory under conditions similar to those around comets.Ribose forms the backbone of DNA and RNA, but its ancient origin remains a mystery. Cornelia Meinert and Uwe Meierhenrich of the University of Nice Sophia

Inside the Fiery Furnace

14 April 2016 - 9:12am
This new image from the VLT Survey Telescope (VST) at ESO’s Paranal Observatory in Chile captures a spectacular concentration of galaxies known as the Fornax Cluster, which can be found in the southern hemisphere constellation of Fornax (The Furnace). The cluster plays host to a menagerie of galaxies of all shapes and sizes, some of which are hiding secrets.

Our top 5 wacky NASA missions that might just happen

13 April 2016 - 9:13am

NASA's Innovative Advanced Concepts programme funds long-shot concepts for further study. This year's include a paper-thin spaceship and a steampunk Venus rover

Billionaire pledges $100m to send spaceships to Alpha Centauri

13 April 2016 - 9:13am

Yuri Milner has backed a plan to research sending tiny, laser-powered spacecraft to the nearest star at 20 per cent of the speed of light

Hawking backs 'starship' project

13 April 2016 - 9:12am

Professor Stephen Hawking backs a project to send spaceships to another solar system within a generation

NASA recovers prized Kepler space telescope after emergency

12 April 2016 - 9:20am

The flagship spacecraft in the search for exoplanets has switched on its emergency mode just prior to a new phase of operations

Planets stripped bare by host stars

12 April 2016 - 9:19am

Astronomers have defined a class of planet that have had their atmospheres stripped away by their host stars.

Mars moons may have formed after collision with Pluto-like world

11 April 2016 - 9:10am

Many think the tiny Phobos and Deimos are merely captured asteroids, but a new model suggests they had a more violent origin

NASA’s Next Great Space Telescope

11 April 2016 - 9:09am

Assembly of the next great space observatory, the James Webb Space Telescope (JWST), is now underway at NASA’s Goddard Space Flight Center.

Lab cooks up sugars from 'comet ice'

11 April 2016 - 9:08am

Experiments show how ribose - an important sugar for life - can form when a simple icy mixture is hit by UV light.

Planet Nine's profile fleshed out

11 April 2016 - 9:08am

Astrophysicists outline what Planet Nine might be like - if indeed it exists.

The colour-changing comet

8 April 2016 - 10:04am

Rosetta's comet has been seen changing colour and brightness in front of the ESA orbiter's eyes, as the Sun's heat strips away the older surface to reveal fresher material.

Behemoth black hole found in an unlikely place [heic1607]

7 April 2016 - 9:36am

Astronomers have uncovered one of the biggest supermassive black holes, with the mass of 17 billion Suns, in an unlikely place: the centre of a galaxy that lies in a quiet backwater of the Universe. The observations, made with the NASA/ESA Hubble Space Telescope and the Gemini Telescope in Hawaii, indicate that these monster objects may be more common than once thought. The results of this study are released in the journal Nature.

Behemoth Black Hole Found in an Unlikely Place

7 April 2016 - 9:35am

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Imagine driving through a small town containing modest-sized buildings and seeing a 100-story skyscraper. Astronomers found the equivalent monstrosity in space: a near-record supermassive black hole that weighs 17 billion suns and lives in a cosmic backwater community of a few galaxies. Until now, extremely massive black holes have been found at the cores of very large galaxies in regions of the universe packed with other large galaxies. This is not just coincidence. Like a cosmic Pac-Man, a monster black hole gobbles smaller black holes when two galaxies collide. This game of bumper cars is common in large galaxy clusters. In fact, the current black hole record holder tips the scale at 21 billion suns and resides in the crowded Coma galaxy cluster, located 330 million light-years away.

Controversial dark-matter claim faces ultimate test

7 April 2016 - 9:34am

Controversial dark-matter claim faces ultimate test

Nature 532, 7597 (2016).

Author: Davide Castelvecchi

Multiple teams finally have the material they need to repeat enigmatic experiment.

Recent near-Earth supernovae probed by global deposition of interstellar radioactive 60Fe

7 April 2016 - 9:34am

Recent near-Earth supernovae probed by global deposition of interstellar radioactive 60Fe

Nature 532, 7597 (2016). doi:10.1038/nature17196

Authors: A. Wallner, J. Feige, N. Kinoshita, M. Paul, L. K. Fifield, R. Golser, M. Honda, U. Linnemann, H. Matsuzaki, S. Merchel, G. Rugel, S. G. Tims, P. Steier, T. Yamagata & S. R. Winkler

The rate of supernovae in our local Galactic neighbourhood within a distance of about 100 parsecs from Earth is estimated to be one every 2–4 million years, based on the total rate in the Milky Way (2.0 ± 0.7 per century). Recent massive-star and supernova activity in Earth’s vicinity may be traced by radionuclides with half-lives of up to 100 million years, if trapped in interstellar dust grains that penetrate the Solar System. One such radionuclide is 60Fe (with a half-life of 2.6 million years), which is ejected in supernova explosions and winds from massive stars. Here we report that the 60Fe signal observed previously in deep-sea crusts is global, extended in time and of interstellar origin from multiple events. We analysed deep-sea archives from all major oceans for 60Fe deposition via the accretion of interstellar dust particles. Our results reveal 60Fe interstellar influxes onto Earth at 1.5–3.2 million years ago and at 6.5–8.7 million years ago. The signal measured implies that a few per cent of fresh 60Fe was captured in dust and deposited on Earth. Our findings indicate multiple supernova and massive-star events during the last ten million years at distances of up to 100 parsecs.

The locations of recent supernovae near the Sun from modelling 60Fe transport

7 April 2016 - 9:34am

The locations of recent supernovae near the Sun from modelling 60Fe transport

Nature 532, 7597 (2016). doi:10.1038/nature17424

Authors: D. Breitschwerdt, J. Feige, M. M. Schulreich, M. A. de. Avillez, C. Dettbarn & B. Fuchs

The signature of 60Fe in deep-sea crusts indicates that one or more supernovae exploded in the solar neighbourhood about 2.2 million years ago. Recent isotopic analysis is consistent with a core-collapse or electron-capture supernova that occurred 60 to 130 parsecs from the Sun. Moreover, peculiarities in the cosmic ray spectrum point to a nearby supernova about two million years ago. The Local Bubble of hot, diffuse plasma, in which the Solar System is embedded, originated from 14 to 20 supernovae within a moving group, whose surviving members are now in the Scorpius–Centaurus stellar association. Here we report calculations of the most probable trajectories and masses of the supernova progenitors, and hence their explosion times and sites. The 60Fe signal arises from two supernovae at distances between 90 and 100 parsecs. The closest occurred 2.3 million years ago at present-day galactic coordinates l = 327°, b = 11°, and the second-closest exploded about 1.5 million years ago at l = 343°, b = 25°, with masses of 9.2 and 8.8 times the solar mass, respectively. The remaining supernovae, which formed the Local Bubble, contribute to a smaller extent because they happened at larger distances and longer ago (60Fe has a half-life of 2.6 million years). There are uncertainties relating to the nucleosynthesis yields and the loss of 60Fe during transport, but they do not influence the relative distribution of 60Fe in the crust layers, and therefore our model reproduces the measured relative abundances very well.

Stellar astrophysics: Supernovae in the neighbourhood

7 April 2016 - 9:33am

Stellar astrophysics: Supernovae in the neighbourhood

Nature 532, 7597 (2016). doi:10.1038/532040a

Authors: Adrian L. Melott

Detailed measurements of radioisotopes in deep-sea deposits, plus modelling of how they reached Earth, indicate that many supernovae have occurred near enough to have potentially influenced evolution. See Letters p.69 & p.73

Astrophysics: Black-hole crackle-and-pop

7 April 2016 - 9:32am

Astrophysics: Black-hole crackle-and-pop

Nature 532, 7597 (2016). doi:10.1038/532009f

Gravitational 'noise' could be easier to detect than previously thought.Gravitational waves were first observed in 2015 by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors (pictured). This demonstrated the existence of binary black holes and suggested that these are more abundant than