Icon of stars shining in white outline, for sentence completion exercise about the Universe.

The Universe
Sentence Completion
Online English Exercise with Answers

The Universe Nouns

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

Big Bang icon

Big Bang

A theory about the birth of the universe.

Black Hole icon

Black Hole

A region where gravity traps everything, even light.

Dark Energy icon

Dark Energy

A mysterious force driving the universe’s accelerated expansion.

Event Horizon icon

Event Horizon

The boundary beyond which nothing escapes a black hole.

Galaxy icon

Galaxy

A vast system of stars, gas, and dust held together by gravity.

Gravity icon

Gravity

An invisible force that pulls objects together.

Light-Year icon

Light-Year

A unit measuring distance light travels in a year.

Nebula icon

Nebula

A cloud of gas and dust where stars form.

Radiation icon

Radiation

Energy released as waves or particles.

Supernova icon

Supernova

A star’s massive explosion at the end of its life.

Sentence Completion 

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

Complete the Sentences with a Noun

Use each word only once

Word Bank

Click each word to cross it off after using it.
  • radiation
  • Big Bang
  • light-year
  • black hole
  • gravity
  • Nebula
  • galaxy
  • supernova
  • event horizon
  • dark energy
An explosion from a can outshine entire galaxies for a few weeks.
A black hole’s intense bends light, hiding its core from view.
The nature of remains one of the greatest mysteries in astrophysics.
Scientists use the theory to explain how stars and planets formed.
The Carina is a region of intense star formation in the Milky Way.
Crossing an means disappearing from the visible universe.
The Earth's atmosphere shields us from harmful ultraviolet .
The in our galaxy’s center is called Sagittarius A*.
Andromeda, a spiral , will collide with the Milky Way in 4 billion years.
Astronomers use the to express distances between stars and galaxies.