What will happen on April 13 2036?

Answer 1

Honestly, no one knows with any degree of certainty.

Speculation has it that 99942 Apophis, a Near Earth Asteroid (NEA) will pass relatively close to Earth. When it was first discovered, belief was that Apophis would strike the Earth, however new estimates are that Apophis has a 1:140,000,000 chance of striking the Earth (generally unlikely).

On the outside chance that Apophis does strike the Earth, its projected path of impact has been refined so that it would be most likely to drop into the North Pacific or Central Atlantic, with smaller likelihood of a land impact over Kazakhstan, Russia, Nicaragua, Venezuela, or the Senegal/Guinea coast. Impact energy is estimated at 750 megatons (the largest nuclear device ever detonated was approximately 56 megatons, and the Chicxulub event is estimated to have release 100 teraton of energy. A direct land strike would produce a 2.7 km crater (slightly larger than Barringer Crater in Arizona), and likely result in a impact winter that could potentially eliminate much of the life on Earth today. A water impact could result in an impact winter scenario, but would definitely cause massive tsunami waves that would travel the entire globe, creating varying levels of devastation along the Earth's Coastlines.

All of this speculation, without question, can cause a great deal of fear and panic, however, it is important to remember that the odds of Apophis striking Earth are in the winning the lottery while being struck by lighting and being eaten by a shark range.

Answer 2

April 13, 2036 is a Thursday. It's impossible to predict specific events that far in advance as it's too distant in the future and unforeseen circumstances can play a role.