Doomsday, it seems, has come and gone countless times.
But one particular prediction for the end of the world has been weighing on the mind of astronomers for more than half a century.
Scientists at Nasa have been watching an asteroid, named 1950 DA, which is currently on a path to collide with Earth on March 16, 2880.
The asteroid is a rock two-thirds of a mile in diameter, travelling at about 15km (nine miles) a second relative to the Earth.
It is due to swing so close to Earth it could slam into the Atlantic Ocean at 38,000 miles per hour.
It is estimated that if 1950 DA were to collide with the planet, it would do so with an force of around 44,800 megatonnes of TNT.
Although the probability of an impact is only 0.3 per cent, this represents a risk 50 per cent greater than an impact from all other asteroids.
Over the long timescales of Earth’s history, asteroids this size and larger have periodically hammered the planet.
The so-called K/T impact, for instance, ended the age of the dinosaurs 65 million years ago.
Asteroid 1950 DA was discovered on 23 February 1950. It was observed for 17 days and then faded from view for half a century.
Then, an object discovered on 31 December 2000 was recognised as being the long-lost 1950 DA.
The New Year’s Eve sighting was exactly 200 years to the night after the discovery of the first asteroid, Ceres.
It was found that the asteroid 1950 DA has a trajectory that for a 20-minute window on March 16, 2880, a collision cannot be entirely ruled out.
Optical observations showed the asteroid rotated once every 2.1 hours, the second fastest spin rate ever observed for an asteroid its size.
But scientists claim there is no cause for concern.
If it is eventually decided 1950 DA needs to be diverted, the hundreds of years of warning could allow a method as simple as dusting the surface of the asteroid with chalk or charcoal, or perhaps white glass beads.
This would change the asteroid’s reflectivity and allow sunlight to do the work of pushing the asteroid out of the way.
Planetary scientists, meanwhile, are getting a better handle on the risks of asteroid impacts. see more
source: dailymail UK