Ninth planet of solar system does exist, believes NASA
As per a NASA report, a ninth planet might be there on the outer edges of our solar system.
Oct 14, 2017, 15:21 PM ISTIs 'Planet X' responsible for mass extinctions on Earth?
The yet undiscovered 'Planet X' may trigger comet showers linked to mass extinctions on our planet, say researchers.
Apr 04, 2016, 18:35 PM IST