A NASA scientists said a comet is capable of an "extinction-level" disaster and are more hazardous than asteroids. The surprising attributes of comets make them harder to detect and deflect.
Is the planet prepared for an asteroid or comet impact? A NASA scientists say there's nothing anyone can do if it does happen unless the agency builds a comet and asteroid rocket that can be built and flown in a span of one year.
A team of scientists has identified the first-ever evidence of a comet colliding with planet Earth about 56 millions of years ago, suggesting that the catastrophic event could have lead to an abrupt warming period or Paleocene-Eocene Thermal Maximum (PETM) on Earth.