50 billion alien worlds in our Galaxy

If you go back in time,  a bit more than 15 years ago, there were only 9 known planets, the ones in our solar system! With the first definitive detection of an exoplanet orbiting another star in 1995 started the modern era of exoplanetary discovery.
Recently, the Kepler mission brought the …

A family portrait, coming from space

Have you ever wondered what our solar system looks like, what you would see if you had the chance to look at it?
Thanks to NASA’s MESSENGER probe, you can now have an idea of what you would see if you were looking at our solar system, from the inside out. …

Music from outer space

Space is a virtual vacuum, in which sound does not propagate. Indeed, sound is an oscillation of pressure transmitted through a solid, a liquid or a gas. Interstellar and interplanetary space being empty, there is no way for any sound to exist out there. While this would make any of …

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