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Part of Einstein's theory of general relativity posits that gravity equals inertial mass -- and for the first time in 10 years, there's new evidence that he's right. Slashdot reader orsayman reports: Most stories around space today seem to revolve around SpaceX, but let's not forget that space is also a place for cool physics experiments. One such experiment currently running into low orbit is the MICROSCOPE satellite launched in 2016 to test the (weak) Equivalence Principle (also knows as the universality of free fall) a central hypothesis in General Relativity.

The first results confirm the principle with a precision ten times better than previous experiments. And it's just the beginning since they hope to increase the precision by another factor of 10. If the Equivalence Principle is still verified at this precision, this could constrain or invalidate some quantum gravity theories. For those of you who are more satellite-science oriented, the satellite also features an innovative "self destruct" mechanism (meant to limit orbit pollution) based on inflatable structures described in this paper.
"The science phase of the mission began in December 2016," reports France's space agency, "and has already collected data from 1,900 orbits, the equivalent of a free fall of 85 million kilometres or half the Earth-Sun distance."

niktemadur writes "The BBC reports that a French team of stellar seismologists, using the COROT Space Telescope, have converted stellar oscillations into sound patterns, a relatively new technique that, according to Professor Eric Michel of the Paris Observatory, is already giving researchers new insight into the inner workings of stars. The subtly pulsating, haunting sounds are very similar to artist Aphex Twin's minimalistic nineties album 'Selected Ambient Works, Vol. 2,' only stripping away what little melody it had and leaving just the beat. These and many more recordings from space can be accessed at the Jodrell Bank Center for Astrophysics website, also known as the Jodcast."

Discover Magazine is running a story detailing the search for planets like Earth orbiting other stars. While we've been able to locate a few "super earths" so far, none of them really compare in size or the potential for habitability with our own world. Fortunately, advances in data analysis and new space-based telescopes — such as Kepler, the James Webb Space Telescope, and the already-launched CoRoT (PDF) — have some astronomers predicting we'll find such an exoplanet by 2010, and a habitable one by 2012. Earth-based telescopes are also in the hunt, though the article notes, "even if a habitable Earth-like world is found first from the ground, it will most likely take a space observatory to search for the chemical signals that tell us what we really want to know: Is anything living out there? If the planet is one that can be observed transiting, it just might be possible to provide a hint of an answer in the next few years."

beebopdebop writes, "The Irish Times notes that Europe goes intergalactic tonight with the broadcast of a program conceived for aliens and broadcast towards a point 45 light years away in the direction of the Big Dipper. The two naked hosts will present their own unclothed bodies as examples of our physical embodiments, and will tell about daily human existence. Music, art, and our own personal messages will be transmitted as well as discussions from sociologists, scientists, and space experts. This project is the brainchild of the French-based Centre National D'etudes Spatiales and is rooted in seriousness as a natural extension of the gold-plated ambassador disks of Pioneer 10. Those of us wishing to be included can still post messages to be sent into space via a CNES antenna. We will have to wait 90 years to learn whether or not some lifeform was listening."