Lunar prospecting: Scanning the skies for moons in other solar systems

The first exoplanet was discovered in 1994. Twenty years later, NASA’s exoplanet catalog lists more than 1700 planets confirmed around other stars. Most of these extra-solar-systems have been measured by changes in light spectra, in stellar motion or dust disks around stars. Some exoplanets-more than 40 as of today-have even been directly photographed. One way or the other, we know that exoplanets are out there in abundance, in places we thought they would be and in places we didn’t dream a planet could possibly exist. So what comes next?

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