An asteroid larger than 1 km passing anywhere in the solar system

A rock passing within 7.5 million kilometers of Earth’s orbit

What defines a 'Potentially Hazardous Asteroid' (PHA)?

This test evaluates knowledge about NASA's efforts to identify, track, and potentially defend Earth from near-Earth asteroids.

The Chelyabinsk meteor exploded over Russia in 2013 injuring 1,200 people

A 1-km asteroid passed within 7 million km of Earth in 2015

NASA tested the DART system on an asteroid in 2013

Which event demonstrated the danger posed by smaller asteroids?

To use visible light to observe distant galaxies

To use infrared light to locate asteroids

To map Potentially Hazardous Asteroids' orbits

What is the purpose of the proposed NEOCam space telescope?

Approximately 1,400 PHAs with no expected threat for the next 100 years

About 900 PHAs all expected to impact Earth soon

Over 25,000 PHAs that are a serious current threat

How many PHAs has NASA mapped, and what is the current threat level they pose?

To explode an asteroid before it reaches Earth

To knock an asteroid's moon, Didymoon, out of its orbit so telescopes can detect the change

To detonate nuclear weapons on Earth to prepare for asteroid impacts

What is the goal of NASA's Double Asteroid Redirection Test (DART)?

What percentage of asteroids near Earth measuring 1 km wide had NASA identified and logged by 2010?

Asteroids larger than 10 kilometers anywhere in the solar system

Objects larger than 1 km within Earth's atmosphere

Objects within 50 million kilometers of Earth's orbit including asteroids the size of mountains

All objects passing within 7.5 million kilometers of Earth

What defines 'near-Earth objects' (NEOs)?

What is the size range of the 'middle-sized' asteroids NASA is now focusing on logging?

How many of the estimated 25,000 asteroids measuring 140 meters or more have been logged so far?

A nuclear rocket launch plan to deflect or destroy threatening asteroids

A telescope designed to detect small asteroids

A space station to monitor asteroid threats

What is the HAMMER mission proposed by NASA?

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