The next transit of Mercury will not be until 2032.
, an educational technology specialist at NASA's Jet Propulsion Laboratory, studying transits can help scientists find new exoplanets—planets outside our solar system. When a planet passes in front of a star it causes a dip in brightness. If this dip happens at regular intervals, it suggests an object is orbiting it.
So far NASA has discovered over 2,700 exoplanets using this technique, Tavernier said, adding the space agency is currently surveying 200,000 more stars in the hope of finding 10,000 more exoplanets.Studying transits can also help us better understand the outermost part of the atmospheres of Mercury and Venus—their exospheres."Some objects, like the Moon and Mercury, were originally thought to have no atmosphere.
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