Our galaxy likely harbors at least 160 billion alien worlds.
Just two decades after first spotting planets orbiting a star other than our own sun, astronomers have notched a big milestone — the 1,000th alien planet.
Two of the five main databases that catalog exoplanet discoveries list 1,010 confirmed alien worlds as of today (Oct. 23, 2013). That’s a lot of progress since 1992, when researchers found the first-ever exoplanets orbiting a spinning neutron star, or pulsar.
“The discovery of many worlds around other stars is a great achievement of science and technology. The work of scientists and engineers from many countries were necessary to achieve this difficult milestone,” Abel Mendez…
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