Vocabulary Lesson
Learn 12 Essential Nouns Related to The Universe
The Universe
NOUN - Basic
All of space, time, matter, and energy in existence.
The age of the universe is estimated to be approximately 13.8 billion years.
Galaxy
NOUN - Basic
A huge collection of stars, gas, dust, and dark matter bound together by gravity.
There are billions of galaxies in the observable universe.
Radiation
NOUN - Basic
Energy released as waves or particles.
The Sun releases various forms of radiation, such as visible light, ultraviolet, infrared, and radio waves.
Gravity
NOUN - Basic
An invisible force that pulls objects together and keeps planets, stars, and galaxies in place.
The theory of general relativity, developed by Albert Einstein, revolutionized our understanding of gravity.
Cosmology
NOUN - Intermediate
The study of the origin and evolution of the universe.
Cosmology is a sub-discipline of astronomy.
The Big Bang
NOUN - Intermediate
A theory about the birth of the universe.
The concept of the Big Bang was first proposed by Belgian priest and physicist Georges Lemaître in 1927.
Light Year
NOUN - Intermediate
The distance light travels in one year, which is about 9.46 trillion kilometers.
Proxima Centauri, the nearest star to our solar system, is about 4 light-years away.
Nebula
NOUN - Intermediate
A massive cloud in space where stars are born from gas and dust.
The Orion Nebula is a stellar nursery where new stars are born.
Supernova
NOUN - Intermediate
A huge explosion that happens when a star dies.
In a supernova, elements such as gold, platinum, and uranium are created.
Dark Energy
NOUN - Advanced
A mysterious force that makes up about 68% of the universe.
Dark energy is responsible for the accelerated expansion of the universe.
Black Hole
NOUN - Advanced
A region in space where gravity is so strong even light can't escape.
Black holes are formed when massive stars collapse in on themselves.
Event Horizon
NOUN - Advanced
The boundary around a black hole that marks the point of no return for any object.
Once something crosses the event horizon, it becomes part of the black hole.
