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Published on 1 December 2012

The red giant cores contract and spin down

Usually, investigating directly the core of the stars is not possible. Usually, when a body contracts, its rotation speeds up. With red giants, things are...
Published on 1 September 2012

Photochemistry on Venus: a very fast evolution

A team of astronomers of the Paris Observatory has just highlighted a very rapid variation of the sulphur dioxide (SO2) on the surface of Venus). Mapping of...
Published on 1 September 2012

Streams in the Milky Way halo : the case of Palomar 5

An international team of astronomers, including two scientists from GEPI, has studied the formation and characteristics of the tidal tails surrounding the...
Published on 1 July 2012

Largest ever Cherenkov telescope sees first light

On 26 July 2012, the H.E.S.S-II telescope started operation in Namibia. Dedicated to observing the most violent and extreme phenomena of the Universe in...
Published on 1 June 2012

AstroConcepts: A Browser Embedded Astrophysical Dictionary

A novel semantic tool created at Paris Observatory provides definitions of astronomical concepts present on any Web page. This tool, called AstroConcepst, is...
Published on 1 May 2012

Colliding galaxy cluster unravelled

LOFAR is a new radio interferometer at very low frequency (wavelength of a few dizains of metres), which is obtaining some of its first images. It has...
Published on 25 April 2012

The history of galaxies is written in the stars

The oldest galaxies in the Universe are up to three times more massive than was previously thought. They contain more dwarf stars and fewer bright giants...
Published on 1 April 2012

Systematic variation of the initial mass fonction (IMF) in early-type galaxies

For a better knowledge of the evolution of galaxies, and of the mass locked up into stars, it is essential to evaluate the initial mass function of stars...
Published on 1 March 2012

Counting down to the Transit of Venus - our nearest exoplanet test-lab

Three months before the last transit of Venus this century, scientists are gathering at the Observatoire de Paris to finalise their observation plans in a...
Published on 1 February 2012

Be stars have a larger core than predicted

Two continuous observations during 27 and 157 days by the CoRoT CNES space mission have allowed an international team led by an astronomer from the Paris...