Relative dating planets
"Kepler has brought a resurgence of astronomical discoveries and we are making excellent progress toward determining if planets like ours are the exception or the rule." The two habitable zone worlds orbiting Kepler-62 have three companions in orbits closer to their star, two larger than the size of Earth and one about the size of Mars.Kepler-62b, Kepler-62c and Kepler-62d, orbit every five, 12, and 18 days, respectively, making them very hot and inhospitable for life as we know it.Using the transit method, Kepler has detected 2,740 candidates.Using various analysis techniques, ground telescopes and other space assets, 122 planets have been confirmed.The five planets of the Kepler-62 system orbit a star classified as a K2 dwarf, measuring just two-thirds the size of the Sun and only one-fifth as bright.At seven billion years old, the star is somewhat older than the Sun.
The inner Solar System is the home to the four terrestrial planets – Mercury, Venus, Earth and Mars.
When a planet candidate transits, or passes in front of the star from the spacecraft's vantage point, a percentage of light from the star is blocked.
The resulting dip in the brightness of the starlight reveals the transiting planet's size relative to its star.
It is only a matter of time before we know if the galaxy is home to a multitude of planets like Earth, or if we are a rarity." The Kepler space telescope, which simultaneously and continuously measures the brightness of more than 150,000 stars, is NASA's first mission capable of detecting Earth-size planets around stars like our Sun.
Orbiting its star every 122 days, Kepler-62e was the first of these habitable zone planets identified.