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Near Earth Objects: A Quiz To Test Your Knowledge!

Near-Earth objects (NEO) are any small solar system body whose orbit brings it to close to Earth. Most known PHOs and NEOs are asteroids, but a small fraction is comets. The United States, the European Union, and other nations...

Questions: 10 | Attempts: 478 | Last updated: Mar 20, 2025

Sample Question 1
Which of the following qualifies a solar system body as a NEO?

If its closest approach to the sun is less than 1.3 astronomical units

If its closest approach to the sun is less than 1.7 astronomical units

If its closest approach to the sun is less than 1.5 astronomical units

If its closest approach to the sun is less than 1.4 astronomical units

Sample Question 2
When is a NEO considered a potentially hazardous object?

If its orbit crosses the Earths and it's larger than 140 meters

If its orbit crosses the Earths and it's larger than 120 meters

If its orbit crosses the Earths and it's larger than 100 meters

If its orbit crosses the Earths and it's larger than 130 meters

Sample Question 3
There are how many known NEOs?

19,220

19,000

19,229

18,589

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