PBS Space Time Season 2015 Episode 40 5 Ways to Stop a Killer Asteroid

PBS Space Time season 2015 episode 40, titled "5 Ways to Stop a Killer Asteroid," explores the various methods that could potentially be used to prevent a catastrophic asteroid impact on Earth. The episode commences by highlighting the catastrophic impacts of asteroids on the Earth that have already occurred in the planet's history, citing the Chicxulub impact event that led to the extinction of the dinosaurs as an example.

The episode then delves into the various ways that scientists propose that we could potentially stop a killer asteroid from colliding with the Earth. The first method discussed is the use of gravitational tugboats, which involves using a spacecraft to fly next to the asteroid for several months or even years, gradually tugging it off course via the gravitational pull of the spacecraft until it veers off course away from Earth. This method is complex and would require a lot of time to execute, but if successful, could be incredibly effective at redirecting an asteroid's trajectory.

The second method presented is the use of a kinetic impactor, which involves using a spacecraft to collide with the asteroid at high velocity, thereby altering its trajectory. This would work best if the asteroid is detected early enough to allow the spacecraft enough time to intercept and collide with it.

The third method discussed is using nuclear weapons to deflect or destroy the asteroid. This method is both complex and potentially dangerous, as it requires the precise placement of an explosion on the asteroid's surface, and there could be unforeseen consequences from the explosion. However, this method could be the most effective in stopping the asteroid from colliding with Earth, especially if other methods have proven to be unsuccessful.

The fourth method presented is the use of a gravity tractor, which involves using a spacecraft to orbit around the asteroid, using its gravity to gradually pull the asteroid off course. This method is similar to the gravitational tugboat method, but instead of using the tug of the spacecraft, it relies on the gravity of the spacecraft itself.

Finally, the episode discusses the use of lasers to stop a killer asteroid. This method involves using high-powered lasers to heat up the surface of the asteroid, which would cause material to be ejected from the asteroid, thereby altering its course. However, this method would require an incredibly accurate understanding of the asteroid's composition, surface, and structure, which may not always be possible.

Throughout the episode, PBS Space Time employs detailed animations and educational graphics to help explain the complex science behind these five methods. The episode serves to educate viewers on what methods scientists are exploring to prevent a catastrophic asteroid collision with Earth, and how these methods may be executed. The show's ability to take complex scientific concepts and present them in an easy-to-understand manner makes it an informative and engaging watch for science enthusiasts and those curious about space and physics.