Phil Plait: How to defend Earth from asteroids

The video discusses the catastrophic asteroid impact that led to the extinction of dinosaurs 65 million years ago, highlighting the scale of the event and its global effects. It then explores smaller asteroid impacts, such as the 1992 event and the Tunguska explosion, and their potential to cause significant damage. The video emphasizes the importance of detecting and preventing asteroid threats, mentioning NASA's efforts and the potential threat of the asteroid Apophis. It outlines various asteroid deflection techniques, including the use of space probes and ion drives, and introduces the B612 Foundation's work in asteroid deflection.

What was the estimated size of the asteroid that caused the extinction of the dinosaurs?

• One mile across

• Three miles across

• Ten miles across

• Six miles across

Where did the asteroid that caused the extinction of the dinosaurs hit the Earth?

• New York

• Arizona

• Yucatan Peninsula

• Siberia

What was the size of the asteroid that created the Meteor Crater in Arizona?

• About 30 to 50 yards across

• About 200 yards across

• About 100 yards across

• About 10 yards across

What was the main cause of damage during the Tunguska event?

• Direct impact with the ground

• Volcanic eruption

• Explosion in the atmosphere

• Tsunami

What is the potential threat posed by the asteroid Apophis?

• It will collide with the Moon

• It will cause a global extinction event

• It will definitely hit Earth in 2029

• It might pass through a keyhole and hit Earth in 2036

What is the first step in preventing an asteroid impact?

• Evacuating major cities

• Developing nuclear weapons

• Finding and tracking asteroids

• Building underground bunkers

What was the purpose of NASA's Deep Impact mission?

• To capture an asteroid

• To create a crater on a comet

• To land on an asteroid

• To destroy an asteroid

What is the role of The B612 Foundation?

• To prevent asteroid impacts

• To study the Moon

• To develop asteroid mining technology

• To build space telescopes

What type of engine is used to gently move an asteroid?

• Solar sail

• Nuclear engine

• Ion drive

• Chemical rocket

What is the key difference between humans and dinosaurs regarding asteroid impacts?

• Dinosaurs had advanced technology

• Humans are immune to asteroids

• Dinosaurs could fly

• Humans have a space program