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Dark matter

UK //dɑːk ˈmæt.ər// US //dɑrk ˈmæt̬.ɚ// Pronunciation

Definition

A form of matter that does not emit light and is detectable through its gravitational effects.

Listen to definition

In simple words: A mysterious substance in space that we cannot see but is believed to exist.

Examples

• Scientists believe dark matter makes up most of the universe's mass.
• The existence of dark matter helps explain the movement of galaxies.
• Research on dark matter continues to challenge our understanding of physics.
• Dark matter cannot be observed directly, making it a topic of much debate.
• Many astrophysicists are dedicated to studying dark matter and its properties.

Usage notes

Commonly used in scientific discussions about cosmology and the universe; avoid in casual conversations.

Grammar pattern

standalone noun phrase

Memory hint

Think of 'dark' as hidden and 'matter' as stuff – hidden stuff in the universe.

Collocations

• dark matter detection
• dark matter hypothesis
• dark matter research

Synonyms

• unknown matter
• invisible matter
• cosmic matter

Common mistakes

• Confused with 'dark energy', which is a different concept.
• Assuming dark matter is visible when it's not.