December 2014
Finding NEO
... suffer another perturbation that ejects them from the solar system. About 20 per cent of NEOs, the potentially hazardous asteroids (PHAs), are in orbits that pass sufficiently close to Earth’s orbit, to within 0.05 AU (about 20 times the Earth–Moon...
June 2020
Saving Earth – time for a new cooperative framework
... become possible. This diagram shows the differences between orbits of a typical near-Earth asteroid (blue) and a potentially hazardous asteroid, or PHA (orange). PHAs have the closest orbits to Earth’s orbit, coming within 5 million miles (about...
March 2016
Space Mining – the Reality of Tomorrow?
... many billions of dollars in profits. This may represent an extreme example, but there are over a million potentially hazardous asteroids (PHA) that are on the order of 30 m in diameter and orbit in close proximity to Earth. The key in the early...
January 2019
Saving humanity – is space up to the job?
... are cataloguing the orbits of near Earth objects (NEOs) and monitoring the paths of potentially hazardous asteroids (PHAs) to predict the possibility of a major asteroid collision with Earth. The United Nations General Assembly has authorised the...
