NASA Found Earth's Cousin Kepler-452b
A planet sometimes quoted to be an Earth's cousin or Earth 2.0 based on its characteristics. known sometime as coruscant by NASA. It orbiting sun like star kepler-452 about 1,402 light years from earth in the constellation Cygnus. It was identified by kepler space telescope, and its discovery announced by NASA on 23 July 2015. It is the first potentially rockey super earth planet discovered orbiting within the habitable zone of a star very similar to the sun. The planet is about 1,400 light year away from the solar system. At the speed of the new horizon spacecraft, about 59,000 km/h, it would take approximately 26 million year ago to get there.
Kepler-452b orbits its host star with an orbital period of 385 days and an orbital radius of about 1.04 AU, nearly the same as Earth's (1 AU). Kepler-452b is most likely not tidally locked, and has a circular orbit. Its host star, Kepler-452, is about 20% more luminous than the Sun (L = 1.2 L).
It is not known if it is a rockey planet but based on small radius, kepler-452b is likely to be rockey. it is not clear if it is not offers habitable environments. it orbits a G2V-type star, like the sun, which is 20% more luminous, with nearly the same temperature and mass. However the star is six billion year old making it 1.4 billion years older then the sun. At this point in its star's evolution, Kepler-452b is receiving 10% more energy from its parent star than Earth is currently receiving from the Sun. If Kepler-452b is a rocky planet, it may be subject to a runway greenhouse effect similar to that seen on Venus. However, due to the planet being 60% bigger than Earth, it is likely to have an estimated mass of 5 M⊕, which could allow it to hold on to any oceans it may have for a longer period, preventing Kepler-452b from succumbing to runaway greenhouse effect for another 500 million years. This in turn would be accompanied with the carbonate–silicate cycle being "buffered" extending its lifetime due to increased volcanic activity on Kepler-452b. This could allow any potential life on the surface to inhabit the planet for another 500–900 million years before the habitable zone is pushed out of Kepler-452b's orbit. Observation and exploration
kepler-452b is 1400 light-years from earth. the fastest current space craft, the new horizons unmanned probe that passed Pluto in July 2015, travels at just 56,628 km/h. At the speed, it would take a spacecraft about 26 million years to reach kepler-452b from earth, if it was going in that direction. Ryan Weed from Positron Dynamics says that with a spacecraft accelerating at a constant 1 g up to a velocity of 0.9995 c and due to time dilation we could reach kepler-452b in 12 years, although from Earth perspective 1,500 years would have passed.