![]() Space telescopes such as CoRoT, Kepler, and TESS have allowed scientists the discovery of about 4000 extrasolar planets (planets around distant stars) within the past 14 years. The newly discovered planet candidate KOI-456.04 and its star Kepler-160 (second panel from above) have great similarities to Earth and Sun (top panel). The Earth is in the right distance from the Sun to have surface temperatures required for the existence of liquid water. Almost all of the Earth-sized planets known to have potentially Earth-like surface temperatures are in orbit around red dwarf stars, which do not emit visible light but infrared radiation instead (bottom panel). Distant worlds: typical exoplanets orbiting around a Sun-like star are about the size of Neptune and are in close orbit (third picture from above).
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