It's Confirmed. We now Know of More Than 5,000 Exoplanets: by BrianKoberlein
official count of known exoplanets
crossed 5,000. On the one hand, there isn’t anything special about 5,000 vs 4,900 or 5,100, but on the other hand, crossing this threshold is an indication of how far we’ve come, and how quickly things will change in the future. Although exoplanets were long thought to exist, it wasn’t until 1992 that the first exoplanet was discovered. Surprisingly, it didn’t orbit a Sun-like star, but rather a stellar remnant pulsar. The planet was discovered by measuring the shift in radio bursts from the pulsar. As the planet tugged at the pulsar along its orbit, the timing of pulses became slightly longer or shorter due to the orbital wobble of the pulsar.
The first big jump in exoplanet discoveries was possible thanks to the Kepler Space Telescope. Launched in 2009, Kepler’s primary mission was to measure the brightness of thousands of stars in a small patch of sky. By 2015 Kepler had discovered more than a thousand exoplanets alone, and astronomers could now use statistical analysis to the types of planets and orbital characteristics most common in star systems.In 2018 the Transiting Exoplanet Survey Satellite was launched.
Five thousand planets is an amazing milestone. But you can be sure that ten thousand worlds will be reached sooner than you think.
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