Institute of Astronomy

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Origin of high-latitude auroras revealed

Astronomy News - 18 December 2014 - 5:27pm

Auroras are the most visible manifestation of the Sun's effect on Earth, but many aspects of these spectacular displays are still poorly understood. Thanks to ESA's Cluster and NASA's IMAGE satellites working together, a particular type of very high-latitude aurora has now been explained.

NASA, Planetary Scientists Find Meteoritic Evidence of Mars Water Reservoir

Astronomy News - 18 December 2014 - 4:00pm

NASA and an international team of planetary scientists have found evidence in meteorites on Earth that indicates Mars has a distinct and global reservoir of water or ice near its surface.

NASA’s Kepler Reborn, Makes First Exoplanet Find of New Mission

Astronomy News - 18 December 2014 - 4:00pm

NASA's planet-hunting Kepler spacecraft makes a comeback with the discovery of the first exoplanet found using its new mission -- K2.

VIDEO: New lights give hope to stargazers

Astronomy News - 18 December 2014 - 2:45pm

New streetlights could reduce the orange glare of older sodium lights meaning clearer conditions for drivers and stargazers.

Herschel's view of the early Universe reveals galaxy cluster fireworks

Astronomy News - 18 December 2014 - 11:28am

Astronomers using ESA's Herschel space observatory have found, for the first time, fireworks of star birth within galaxies at the dense core of a massive early Universe galaxy cluster. This frenzy of star formation reveals the young lives of now "red and dead" elliptical galaxies and gives new clues to the evolution of some of the largest structures in the Universe.

Philae comet landing 'all a blur'

Astronomy News - 17 December 2014 - 6:06pm

An image has been released that shows the hairy moment that the Philae comet lander bounced back into space.

#RosettaWatch: Comet lander could wake up next year

Astronomy News - 17 December 2014 - 6:02pm
The Philae lander is getting enough sunlight to keep warm, team members say, and the Rosetta spacecraft may have already taken pictures of its landing spot






Star's flying visit could fling comets at Earth

Astronomy News - 17 December 2014 - 5:16pm
It might not happen for a quarter of a million years, but a nearby star coming closer to the sun could send planetary remnants hurtling to Earth






NASA to Discuss Today Asteroid Redirect Mission Capture Concept, Next Step in Journey to Mars

Astronomy News - 17 December 2014 - 4:00pm

NASA will host a media teleconference at 4 p.m. EST today during which agency officials will discuss and answer questions on the selection of an Asteroid Redirect Mission concept.

The Hot Blue Stars of Messier 47

Astronomy News - 17 December 2014 - 11:00am
This spectacular image of the star cluster Messier 47 was taken using the Wide Field Imager camera, installed on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile. This young open cluster is dominated by a sprinkling of brilliant blue stars but also contains a few contrasting red giant stars.

Astronomy: Exoplanet seen from Earth

Astronomy News - 17 December 2014 - 12:00am

Astronomy: Exoplanet seen from Earth

Nature 516, 7531 (2014). doi:10.1038/516291e

Using a modest-sized ground-based telescope, astronomers have spotted a planet twice the size of Earth passing in front of its host star.Researchers typically study planets outside the Solar System using space telescopes or much larger telescopes on Earth, but studies with space telescopes are

Astrobiology: Prescient words on comets and life

Astronomy News - 17 December 2014 - 12:00am

Astrobiology: Prescient words on comets and life

Nature 516, 7531 (2014). doi:10.1038/516329a

Author: Milton Wainwright

The landing of the Philae probe on comet 67P/Churyumov–Gerasimenko last month has led to speculation that comets might have delivered the building-block elements of life to Earth — an idea anticipated by the French astronomer Camille Flammarion more than a century ago in his 1880

The exclusion of a significant range of ages in a massive star cluster

Astronomy News - 17 December 2014 - 12:00am

The exclusion of a significant range of ages in a massive star cluster

Nature 516, 7531 (2014). doi:10.1038/nature13969

Authors: Chengyuan Li, Richard de Grijs & Licai Deng

Stars spend most of their lifetimes on the main sequence in the Hertzsprung–Russell diagram. The extended main-sequence turn-off regions—containing stars leaving the main sequence after having spent all of the hydrogen in their cores—found in massive (more than a few tens of thousands of solar masses), intermediate-age (about one to three billion years old) star clusters are usually interpreted as evidence of internal age spreads of more than 300 million years, although young clusters are thought to quickly lose any remaining star-forming fuel following a period of rapid gas expulsion on timescales of order 107 years. Here we report, on the basis of a combination of high-resolution imaging observations and theoretical modelling, that the stars beyond the main sequence in the two-billion-year-old cluster NGC 1651, characterized by a mass of about 1.7 × 105 solar masses, can be explained only by a single-age stellar population, even though the cluster has a clearly extended main-sequence turn-off region. The most plausible explanation for the existence of such extended regions invokes a population of rapidly rotating stars, although the secondary effects of the prolonged stellar lifetimes associated with such a stellar population mixture are as yet poorly understood. From preliminary analysis of previously obtained data, we find that similar morphologies are apparent in the Hertzsprung–Russell diagrams of at least five additional intermediate-age star clusters, suggesting that an extended main-sequence turn-off region does not necessarily imply the presence of a significant internal age dispersion.

Curiosity Detects Methane Spike on Mars

Astronomy News - 16 December 2014 - 10:17pm
NASA's Mars Curiosity rover has measured a tenfold spike in methane, an organic chemical, in the atmosphere around it and detected other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill.

Asteroid soil could fertilise farms in space

Astronomy News - 16 December 2014 - 8:30pm

We can now grow plants in microgravity – and crops grown in asteroid soil could sustain vast human populations off-planet






Methane 'belches' detected on Mars

Astronomy News - 16 December 2014 - 6:39pm

Nasa's Curiosity rover has detected "belches" of methane gas on Mars - a gas that could hint at past or even present life on the planet.

Venus Express goes gently into the night

Astronomy News - 16 December 2014 - 5:34pm

ESA's Venus Express has ended its eight-year mission after far exceeding its planned life. The spacecraft exhausted its propellant during a series of thruster burns to raise its orbit following the low-altitude aerobraking earlier this year.

Voyager Buffeted by Interstellar 'Tsunami Waves'

Astronomy News - 16 December 2014 - 4:47pm
Since 2012, NASA's Voyager 1 spacecraft has experienced three 'tsunami waves' in interstellar space. The most recent, which reached the spacecraft earlier this year, is still propagating outward according to new data.

NASA Awards Launch Services Contract for Transiting Exoplanet Survey Satellite

Astronomy News - 16 December 2014 - 4:00pm
NASA has selected SpaceX to provide launch services for the Transiting Exoplanet Survey Satellite (TESS) mission. TESS will launch aboard a Falcon 9 v1.1 launch vehicle, with liftoff targeted for August 2017 from Cape Canaveral Air Force Station in Florida.

NASA Rover Finds Active, Ancient Organic Chemistry on Mars

Astronomy News - 16 December 2014 - 4:00pm

NASA's Mars Curiosity rover has measured a tenfold spike in methane, an organic chemical, in the atmosphere around it and detected other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill.