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Mars Lost Atmosphere to Space

NASA’s MAVEN mission has confirmed that the solar wind stripped the Red Planet of its atmosphere.

This image shows an artist concept of NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft, which reached the Red Planet on September 21, 2014.Lockheed Martin

This image shows an artist concept of NASA’s Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft, which reached the Red Planet on September 21, 2014.

Lockheed Martin

Mars is the little planet that couldn’t. Its

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Le ciel du mois d’avril (heures en TU +…

 

  • Samedi 1er, conjonction entre Aldebaran et la Lune, à 0°20′ (occultation d’Aldebaran par la Lune, visible depuis l’est et le nord-est de l’Afrique, l’Arabie, l’Asie, le Japon, le nord-ouest de l’Océan Pacifique) ; A 10h17 plus grande élongation de Mercure à l’est du Soleil, à 18°59’41 ».
  • Lundi
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Rosetta Sees Changing Face of Comet 67P

Researchers have used data from the Rosetta mission to link outbursts on Comet 67P/Churyumov-Gerasimenko with dramatic surface changes.

Rosetta Selfie with Comet 67P

A « Rosetta selfie » snapped by the Comet Infrared Visible Analyser (CIVA) aboard Philae in 2014, with Comet 67P in the background.

ESA / Rosetta / Philae / CIVA

What’s it

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Stars Born in Galactic Wind

Astronomers have found newborn stars in gas pouring out of a galactic nucleus.

stars forming in galactic outflow

ESO / M. Kornmesser

This artist’s illustration depicts stars forming in gas streaming out of the center of a galaxy. Outflows are a natural part of galaxy development, powered by bursts of starbirth or maniacally accreting black

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Des étoiles nées au sein de jets issus de…

eso1710fr — Communiqué de presse scientifique

Le VLT de l’ESO détecte un tout nouveau mode de formation stellaire

27 mars 2017

Des observations effectuées au moyen du Very Large Telescope de l’ESO ont révélé la formation d’étoiles au sein de puissants jets de matière issus de trous noirs supermassifs occupant

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Bright Supernova Erupts in NGC 5643 in Lupus

A recently discovered supernova in Lupus now shines around magnitude +11.5, bright enough to see in a modest telescope. With photos and maps, we’ll get you there.

Bright Supernova Beckons

Supernova 2017cbv in the +10.7 magnitude southern galaxy NGC 5643 has bolted to magnitude +11.5 in recent days, making it a fine amateur

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Less Dark Matter in Young Galaxies?

A new study of six young, star-forming galaxies suggests they’re less influenced by dark matter than expected. But the results may say more about galaxy evolution than about the nature of dark matter.

Galaxy rotation curves

This artist’s impression compares rotating disk galaxies in the distant universe (right) and the present

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La moindre influence de la matière noire au sein…

eso1709fr — Communiqué de presse scientifique

Des observations de galaxies distantes effectuées au moyen du VLT suggèrent la prédominance de la matière ordinaire

15 mars 2017

De nouvelles observations suggèrent que les galaxies massives, à taux de formation stellaire élevé et datées de 10 milliards d’années, soit de l’âge d’or

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Swift Black Hole Winds May Shape Galaxy

Winds that charge away from supermassive black holes at a fraction of the speed of light have long been mysterious and even contentious. Now, new evidence sheds light on their origins.

Black hole winds

This artist’s impression illustrates a supermassive black hole with X-ray emission emanating from its inner region (pink) and ultra-fast

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Bright Mound on Ceres Due to Briny Eruptions?

The strange bright deposits inside Occator crater on Ceres are probably from cryovolcanic eruptions that are much younger than the crater itself.

White spots on Ceres

White spots dot the floor of Occator, a crater on Ceres that’s 92 km (57 miles) across. NASA’s Dawn spacecraft has seen haze inside the crater that appears

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A New Take on the Audible Meteor Mystery

A recent study suggests a plausible mechanism to explain why observers sometimes hear superbright meteors at the same time that they see them.

Fireball over ALMA

A brilliant fireball captured over the Atacama Large Millimeter/submillimeter Array (ALMA) located on the Chajnantor Plateau in the Chilean Andes.

ESO/C. Malin

Having a bad hair day?

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