kepler-452b
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kepler-452b
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Weight: 8.00 kg
most habitable planet other than earth in the universe
Kepler-452b is an exoplanet discovered in 2015 that is about 60% larger than Earth and orbits in the habitable zone of a sun-like star. It takes 385 days to complete one orbit and is located roughly 1,400 light-years away in the constellation Cygnus. Nicknamed "Earth's cousin," it is considered one of the most Earth-like planets found to date because its star and orbital distance are similar to our solar system.
This video explains the discovery of Kepler-452b and its characteristics:
There is no definitive "most habitable planet" other than Earth, as "habitable" can be defined in many ways. For near-term human exploration, Mars is often considered the most plausible candidate despite its significant challenges, such as a thin atmosphere and cold temperatures. In the long-term, exoplanets like the potentially Earth-like Kepler-452b, located in another star system, are also candidates, though they are very distant. For the potential of native life, moons like Europa and Enceladus are considered good candidates due to their subsurface oceans.
Within the Solar System
- Mars: This is the most plausible candidate for near-term human-assisted habitation due to its solid ground, water ice, and modest gravity. However, challenges include a thin atmosphere, low pressure, cold temperatures, and high radiation.
- Venus: While the surface is scorching, the upper atmosphere (
kilometers up) has a more Earth-like pressure, gravity, and temperature, and its clouds could offer protection from solar radiation. Some suggest "cloud cities" could be built in its upper atmosphere.
- Europa and Enceladus: Jupiter's moon Europa and Saturn's moon Enceladus are considered prime locations for finding native life due to their global subsurface oceans.
Exoplanets (outside the Solar System)
- Kepler-452b: This is one of the most Earth-like exoplanets discovered, orbiting within the habitable zone of a sun-like star. It is roughly
wider than Earth and is located
light-years away.
- Kepler-22b: The first planet discovered in the habitable zone of a sun-like star, it is about
light-years away.
- Gliese 12 b: Located
light-years away, this planet is considered a good candidate for habitability.
- KOI 5715.01: This exoplanet is
light-years away and has been suggested as potentially more hospitable than Earth by some astronomers.
- Proxima Centauri b: This planet orbits the closest star to our Sun, but is likely tidally locked, which could create extreme climates.
Factors to consider
- Definition of habitable: "Habitable" can mean different things to different people. For example, some consider Mars not truly habitable because you need a full space suit to survive on the surface, while others argue that a place is more habitable if it doesn't require a space suit, even if it has other problems.
- Technological feasibility: The ability to travel to and establish a base on other planets is a major consideration.
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