Is '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
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