Gaia satellite launches, will chart 1 billion stars 70 times over 5 years
The European Space Agency last week launched Gaia, a star-charting satellite that will repeatedly survey a billion stars over the course of five years. It is en route to a virtual orbit point called "L2", 1.5 million km further from the sun than the planet Earth orbits. It will measure the position, brightness, temperature and chemical composition of each star 70 times.
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