Recently NASA’s Transiting Exoplanet Survey Satellite (TESS) discovered earth sized exoplanet
These are the planets which are not part of our solar system. That means, these planets orbit around other stars.
Example: Kepler 16b
Goldilocks zone is such a zone other than earth where life can exist. It is also called as habitable zone.
Astronomers who look for earth like planets look for such planets where water remains liquid at right temperature.
To be habitable, planets should not be so old that they have exhausted their geothermal heat and lack protective geomagnetic fields.
Earth is around 4.5 billion years old, but the researchers argue that the sweet spot for life is a planet that is between 5 billion to 8 billion years old. Size and mass also matter.
A planet that is 10% larger than the Earth should have more habitable land, the researchers said.
One that is about 1.5 times Earth’s mass would be expected to retain its interior heating through radioactive decay longer and would also have a stronger gravity to retain an atmosphere over a longer time period, they said.
Recently researchers from the Washington State University (WSU) identified 24 habitable exoplanets.