We have launched our mobile app, get it now. Call : 9354229384, 9354252518, 9999830584.  

Current Affairs

Goldilocks zone

Date: 09 January 2020 Tags: Space

Issue

NASA has reported the discovery of an Earth-size planet, named TOI 700 d, orbiting its star in the “goldilocks zone”.

 

Background

A habitable zone, also called the “Goldilocks zone”, is the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets.

 

Details

  • Earth is in the Sun’s Goldilocks zone. If Earth were where the dwarf planet Pluto is, all its water would freeze; on the other hand, if Earth were where Mercury is, all its water would boil off.

  • When scientists search for the possibility of alien life, any rocky exoplanet in the habitable zone of its star is an exciting find.

  • The newest such planet was found by NASA’s Transiting Exoplanet Survey Satellite (TESS) mission, which it launched in 2018.

  • Very few such Earth-size planets have been found so far, including some by NASA’s Kepler mission, and this one is the first such discovery by TESS.

  • The find was confirmed by the Spitzer Space Telescope, which sharpened the measurements that TESS had made, such as orbital period and size.

New discovered planet

  • TOI 700 d measures 20% larger than Earth. It orbits its star once every 37 days and receives an amount of energy that is equivalent to 86% of the energy that the Sun provides to Earth.

  • The star, TOI 700, is an “M dwarf” located just over 100 light-years away in the southern constellation Dorado, is roughly 40% of our Sun’s mass and size, and has about half its surface temperature.

TOI 700 d is the outermost planet, and the only one in the star’s habitable zone.