Planetary defense | Wikipedia audio article
Channel: wikipedia tts
Date: 02/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Asteroid_impact_avoidance


00:02:26 1 Deflection efforts
00:05:38 1.1 History of government mandates
00:12:02 1.2 Ongoing projects
00:17:03 1.2.1 Sentinel Mission
00:19:11 1.3 Prospective projects
00:20:13 1.4 Detection from space
00:21:48 1.5 Deep Impact
00:23:16 2 Impact probability calculation pattern
00:25:06 3 Collision avoidance strategies
00:29:57 3.1 Nuclear explosive device
00:32:01 3.1.1 Stand-off approach
00:36:55 3.1.2 Surface and subsurface use
00:40:05 3.1.3 Comet deflection possibility
00:42:01 3.1.4 Present capability
00:43:09 3.1.5 Law
00:44:11 3.2 Kinetic impact
00:48:34 3.3 Asteroid gravity tractor
00:50:31 3.4 Ion beam shepherd
00:51:19 3.5 Use of focused solar energy
00:52:06 3.6 Mass driver
00:53:04 3.7 Conventional rocket engine
00:54:13 3.8 Asteroid laser ablation
00:56:32 3.9 Other proposals
00:58:27 4 Deflection technology concerns
01:00:54 5 Planetary defense timeline
01:05:27 6 Fictional representations
01:06:04 6.1 Film
01:08:15 6.2 Literature
01:10:11 6.3 Television
01:13:24 6.4 Video games



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SUMMARY
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Asteroid impact avoidance comprises a number of methods by which near-Earth objects (NEO) could be diverted, preventing destructive impact events.  A sufficiently large impact by an asteroid or other NEOs would cause, depending on its impact location, massive tsunamis, multiple firestorms and an impact winter caused by the sunlight-blocking effect of placing large quantities of pulverized rock dust, and other debris, into the stratosphere.
A collision 66 million years ago between the Earth and an object approximately 10 kilometres (6 miles) wide is thought to have produced the Chicxulub crater and the Cretaceous–Paleogene extinction event, widely held responsible for the extinction of most dinosaurs.
While the chances of a major collision are low in the near term, there is a high probability that one will happen eventually unless defensive actions are taken. Astronomical events—such as the Shoemaker-Levy 9 impacts on Jupiter and the 2013 Chelyabinsk meteor, along with the growing number of objects on the Sentry Risk Table—have drawn renewed attention to such threats.
In 2016, a NASA scientist warned that the Earth is unprepared for such an event.  In April 2018, the B612 Foundation reported "It's 100 per cent certain we'll be hit [by a devastating asteroid], but we're not 100 per cent sure when." Also in 2018, physicist Stephen Hawking, in his final book Brief Answers to the Big Questions, considered an asteroid collision to be the biggest threat to the planet. Several ways of avoiding an asteroid impact have been described. Nonetheless, in March 2019, scientists reported that asteroids may be much more difficult to destroy than thought earlier. In addition, an asteroid may reassemble itself due to gravity after being disrupted.