Icon of stars and planets in white outline, for sentence completion exercise about Astronomy.

Astronomy
Sentence Completion
Online English Exercise with Answers

Astronomy Nouns

Study the vocabulary and definitions to complete the sentences in this exercise.

asteroid icon

Asteroid

A small rocky body orbiting the sun.

comet icon

Comet

An icy object that glows with a tail when near the Sun.

constellation icon

Constellation

A group of stars making a pattern in the sky.

crater icon

Crater

A bowl-shaped hole on a planet, moon, or asteroid formed by an impact.

eclipse icon

Eclipse

When one space object blocks the light of another.

impact icon

Impact

When a space object collides with another celestial body.

luminosity icon

Luminosity

The amount of energy a star releases.

meteor icon

Meteor

A space rock that burns up in Earth's atmosphere, creating a streak of light.

observatory icon

Observatory

A building designed to observe stars and planets using powerful telescopes

solar flare icon

Solar Flare

A sudden burst of intense energy from the Sun’s surface.

Sentence Completion 

Practice with a free fill-in-the-blank online exercise with answers on 10 facts about Astronomy.

Complete the Sentences with a Noun

Use each word only once

Word Bank

Click each word to cross it off after using it.
  • asteroid
  • meteor
  • observatory
  • comet
  • solar flare
  • luminosity
  • eclipse
  • impact
  • crater
  • constellation
A develops a glowing tail as it nears the sun and its ice vaporizes.
The longest recent total was on July 22, 2009, lasting 6 minutes and 39 seconds.
NASA recently landed a rover to investigate a deep on Mars.
Astronomers measure a star's to learn about its energy and estimate its age.
The largest known , Ceres, is about 940 kilometers wide.
In 2024, NASA's Perseverance team studied a meteoroid on Mars to uncover its geological past.
The Ursa Major includes the Big Dipper, a well-known star pattern.
In Hawaii, the Mauna Kea has telescopes that scan distant galaxies.
The Perseid shower lights up the night sky every August.
A releases energy equivalent to millions of hydrogen bombs.