Institute of Astronomy

Astronomy News

Kepler Discovers 1000th Exoplanet

8 January 2015 - 5:09am
How many stars like our sun host planets like our Earth? NASA’s Kepler Space Telescope continuously monitored more than 150,000 stars beyond our solar system, and to date has offered scientists an assortment of more than 4,000 candidate planets for further study -- the 1,000th of which was recently verified.

Explosive stellar tussle revealed

8 January 2015 - 4:06am

Astrophysicists studying the unstable "stellar monster" Eta Carinae unveil fresh insights and a 3D model of the destructive maelstrom at its heart.

Hubble: Pillars of Creation are … lars of Destruction

7 January 2015 - 11:17pm
Recently, Hubble revisited the famous "Pillars of Creation," providing astronomers with a sharper and wider view of the iconic star forming region. The image hints that the Pillars of Creation might also be "pillars of destruction."

Brave new world-hunters spot exoplanets on the cheap

7 January 2015 - 9:33pm

You don't need a multi-million-dollar budget to find alien worlds – off-the-shelf scopes rigged together can spot our cosmic neighbours too






The temperature and chronology of heavy-element synthesis in low-mass stars

7 January 2015 - 7:59pm

The temperature and chronology of heavy-element synthesis in low-mass stars

Nature 517, 7533 (2015). doi:10.1038/nature14050

Authors: P. Neyskens, S. Van Eck, A. Jorissen, S. Goriely, L. Siess & B. Plez

Roughly half of the heavy elements (atomic mass greater than that of iron) are believed to be synthesized in the late evolutionary stages of stars with masses between 0.8 and 8 solar masses. Deep inside the star, nuclei (mainly iron) capture neutrons and progressively build up (through the slow-neutron-capture process, or s-process) heavier elements that are subsequently brought to the stellar surface by convection. Two neutron sources, activated at distinct temperatures, have been proposed: 13C and 22Ne, each releasing one neutron per α-particle (4He) captured. To explain the measured stellar abundances, stellar evolution models invoking the 13C neutron source (which operates at temperatures of about one hundred million kelvin) are favoured. Isotopic ratios in primitive meteorites, however, reflecting nucleosynthesis in the previous generations of stars that contributed material to the Solar System, point to higher temperatures (more than three hundred million kelvin), requiring at least a late activation of 22Ne (ref. 1). Here we report a determination of the s-process temperature directly in evolved low-mass giant stars, using zirconium and niobium abundances, independently of stellar evolution models. The derived temperature supports 13C as the s-process neutron source. The radioactive pair 93Zr–93Nb used to estimate the s-process temperature also provides, together with the pair 99Tc–99Ru, chronometric information on the time elapsed since the start of the s-process, which we determine to be one million to three million years.

Where Did All the Stars Go?

7 January 2015 - 12:25pm
Some of the stars appear to be missing in this intriguing new ESO image. But the black gap in this glitteringly beautiful starfield is not really a gap, but rather a region of space clogged with gas and dust. This dark cloud is called LDN 483 — for Lynds Dark Nebula 483. Such clouds are the birthplaces of future stars. The Wide Field Imager, an instrument mounted on the MPG/ESO 2.2-metre telescope at ESO's La Silla Observatory in Chile, captured this image of LDN 483 and its surroundings.

'Alien Earth' among eight new planets

7 January 2015 - 12:34am

One of eight new planets spied in distant solar systems has usurped the title of "most Earth-like alien world", astronomers say.

NASA’s Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones

6 January 2015 - 6:38pm

How many stars like our sun host planets like our Earth? NASA’s Kepler Space Telescope continuously monitored more than 150,000 stars beyond our solar system, and to date has offered scientists an assortment of more than 4,000 candidate planets for further study -- the 1,000th of which was recently verified.

Andromeda in HD - Hubble captures the sharpest ever view of neighbouring spiral Galaxy [heic1502]

6 January 2015 - 2:51pm

The NASA/ESA Hubble Space Telescope has captured the sharpest and biggest image ever taken of the Andromeda galaxy - otherwise known as Messier 31. The enormous image is the biggest Hubble image ever released and shows over 100 million stars and thousands of star clusters embedded in a section of the galaxy's pancake-shaped disc stretching across over 40 000 light-years.

Hubble's new view of iconic 'Pillars of Creation'

6 January 2015 - 12:52pm

One of the most famous pictures of the cosmos has received a high-def update thanks to a new camera installed on the Hubble Space Telescope






Age of stars is pinned to their spin

6 January 2015 - 4:53am

Astronomers prove they can accurately tell a star's age from how fast it spins, after measuring the spin speed of stars more than a billion years old.

Hubble Goes High Def to Revisit the Iconic 'Pillars of Creation'

5 January 2015 - 10:41pm

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Although NASA's Hubble Space Telescope has taken many breathtaking images of the universe, one snapshot stands out from the rest: the iconic view of the so-called "Pillars of Creation." The jaw-dropping photo, taken in 1995, revealed never-before-seen details of three giant columns of cold gas bathed in the scorching ultraviolet light from a cluster of young, massive stars in a small region of the Eagle Nebula, or M16.

Hubble Discovers that Milky Way Core Drives Wind at 2 Million Miles Per Hour

5 January 2015 - 10:41pm

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At a time when our earliest human ancestors had recently mastered walking upright, the heart of our Milky Way galaxy underwent a titanic eruption, driving gases and other material outward at 2 million miles per hour. Now, at least 2 million years later, astronomers are witnessing the aftermath of the explosion: billowing clouds of gas towering about 30,000 light-years above and below the plane of our galaxy.

Hubble's High-Definition Panoramic View of the Andromeda Galaxy

5 January 2015 - 10:41pm

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The largest NASA Hubble Space Telescope image ever assembled, this sweeping view of a portion of the Andromeda galaxy (M31) is the sharpest large composite image ever taken of our galactic neighbor. Though the galaxy is over 2 million light-years away, the Hubble telescope is powerful enough to resolve individual stars in a 61,000-light-year-long section of the galaxy's pancake-shaped disk. It's like photographing a beach and resolving individual grains of sand. And, there are lots of stars in this sweeping view over 100 million, with some of them in thousands of star clusters seen embedded in the disk. This ambitious photographic cartography of the Andromeda galaxy represents a new benchmark for precision studies of large spiral galaxies which dominate the universe's population of over 100 billion galaxies. Never before have astronomers been able to see individual stars over a major portion of an external spiral galaxy. Most of the stars in the universe live inside such majestic star cities, and this is the first data that reveal populations of stars in context to their home galaxy.

NASA’s Chandra Detects Record-Breaking Outburst from Milky Way’s Black Hole

5 January 2015 - 10:38pm

Astronomers have observed the largest X-ray flare ever detected from the supermassive black hole at the center of the Milky Way galaxy. This event, detected by NASA’s Chandra X-ray Observatory, raises questions about the behavior of this giant black hole and its surrounding environment.

NASA's Messenger probe ready for final tour of Mercury

5 January 2015 - 3:10pm
With the first spacecraft to orbit Mercury about to fire its booster one last time, NASA is holding a public contest to name five of the planet's craters






Philae comet lander eludes discovery

5 January 2015 - 2:33pm

The precise location of the Europe's Philae comet lander continues to evade detection despite an intense imaging campaign by the Rosetta satellite.