Issue #3(21) 2019 Science

A new era in planetary defence missions

Technology to deflect asteroids approaching Earth will almost certainly be needed to prevent potentially devastating impacts.
Technology to deflect asteroids approaching Earth will almost certainly be needed to prevent potentially devastating impacts.
Sean Blair ESA, Leiden, the Netherlands
Nancy L Chabot Johns Hopkins University Applied Physics Laboratory, Laurel MD, USA

Our planet has been the target of many meteor strikes over the eons, and it is just a matter of time before one collides with us again. Hoping to divert a potential modern day and world wide devastating event are two dedicated missions that will test out key deflective technology on a pair of asteroids 10 million kilometres from Earth.

Throughout its history, the Earth has been continually impacted by asteroids and comets. Some impacts have had catastrophic effects, such as the one believed to be responsible for the extinction of the dinosaurs 65 million years ago. Other impacts, on a much smaller scale, happen all the time, providing the tens of thousands of meteorite samples that are studied around the world to learn about the earliest days of our Solar System. The combined activities undertaken to understand the hazards posed by these natural objects impacting our planet, and the efforts to develop approaches for avoiding impacts or managing their aftermath, is the purview of planetary defence matters.

While planetary defence activities have been occurring for decades, (in particular, searching for and tracking near-Earth asteroids), planetary defence efforts have not risen to the level, or the budgets, of having dedicated spacecraft missions. The most immediately relevant objects for planetary defence are asteroids of an intermediate scale, ones on the order of a few hundred metres.

To continue reading this premium article, subscribe now for unlimited access to all online content

If you already have a login and password to access www.room.eu.com - Please log in to be able to read all the articles of the site.

Popular articles

See also

Security

Exploring the problems of criminal justice in space

Opinion

Time to overcome the expendable rocket mindset

Astronautics

Bridging the ‘digital divide’ with nanosatellites

Popular articles

LSST at sunset, taken from behind the nearby Gemini telescope at the Cerro Pachón ridge in Chile. Opinion

Satellite mega-constellations pose threat to ground-based astronomy

New space centre Moscow. Specials

Reviving Russia’s space programme