Stars, Galaxies and Universe

Science

Watch Lesson: Stars, Galaxies and Universe

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the brightness of a star as seen from a distance of 10 parsecs

The Brightness Of A Star As Seen From A Distance Of 10 Parsecs.

Absolute Magnitude

Absolute Magnitude Simple Definition

the brightness of a star as seen from Earth

The Brightness Of A Star As Seen From Earth.

Apparent Magnitude

Apparent Magnitude Simple Definition

states that the universe began with a huge explosion 13.8 billion years ago

States That The Universe Began With A Huge Explosion 13.8 Billion Years Ago.

Big Bang Theory

Big Bang Theory Simple Definition

a star system with two stars

A Star System With Two Stars.

Binary Star

Binary Star Simple Definition

a region in space with gravity so strong that no matter or light can escape it

A Region In Space With Gravity So Strong That No Matter Or Light Can Escape It.

Black Hole

Black Hole Simple Definition

the middle layer of the Sun's atmosphere

The Middle Layer Of The Sun's Atmosphere.

Chromosphere

Chromosphere Simple Definition

a pattern or shape formed by a group of stars

A Pattern Or Shape Formed By A Group Of Stars.

Constellation

Constellation Simple Definition

the outermost layer of the Sun’s atmosphere

The Outermost Layer Of The Sun’s Atmosphere.

Corona

Corona Simple Definition

the electromagnetic radiation left over from the big bang

The Electromagnetic Radiation Left Over From The Big Bang.

Cosmic Background Radiation

Cosmic Background Radiation Simple Definition

all the wavelengths or frequencies of electromagnetic radiation

All The Wavelengths Or Frequencies Of Electromagnetic Radiation.

Electromagnetic Spectrum

Electromagnetic Spectrum Simple Definition

a massive system of stars, gases, and dust held together by gravity

A Massive System Of Stars, Gases, And Dust Held Together By Gravity.

Galaxy

Galaxy Simple Definition

a large group of old stars densely packed into a roughly spherical shape

A Large Group Of Old Stars Densely Packed Into A Roughly Spherical Shape.

Globular Cluster

Globular Cluster Simple Definition

a graph that plots the surface temperature of stars against their absolute brightness

A Graph That Plots The Surface Temperature Of Stars Against Their Absolute Brightness.

Hertzsprung Russell Diagram

Hertzsprung Russell Diagram Simple Definition

states that the farther away a galaxy is, the faster it is moving away (as the universe expands)

States That The Farther Away A Galaxy Is, The Faster It Is Moving Away (as The Universe Expands).

Hubbles Law

Hubbles Law Simple Definition

the distance light travels in a year: 9.5 trillion km

The Distance Light Travels In A Year: 9.5 Trillion Km.

Light Year

Light Year Simple Definition

the distinct diagonal band on an H-R diagram that includes 90% of all stars

The Distinct Diagonal Band On An H-R Diagram That Includes 90% Of All Stars.

Main Sequence

Main Sequence Simple Definition

a huge cloud of gas and dust in space, where new stars form

A Huge Cloud Of Gas And Dust In Space, Where New Stars Form.

Nebula

Nebula Simple Definition

a dense core composed mainly of neutrons, left behind after a supernova explosion

A Dense Core Composed Mainly Of Neutrons, Left Behind After A Supernova Explosion.

Neutron Star

Neutron Star Simple Definition

the process by which hydrogen atoms join together to form helium, inside the sun

The Process By Which Hydrogen Atoms Join Together To Form Helium, Inside The Sun.

Nuclear Fusion In The Sun

Nuclear Fusion In The Sun Simple Definition

a group of no more than a few thousand stars, all of which are about the same age

A Group Of No More Than A Few Thousand Stars, All Of Which Are About The Same Age.

Open Cluster

Open Cluster Simple Definition

the apparent change in position of an object when viewed from different places

The Apparent Change In Position Of An Object When Viewed From Different Places.

Parallax

Parallax Simple Definition

the surface layer of the Sun that gives off light

The Surface Layer Of The Sun That Gives Off Light.

Photosphere

Photosphere Simple Definition

a very young star, before nuclear reactions begin at its core

A Very Young Star, Before Nuclear Reactions Begin At Its Core.

Protostar

Protostar Simple Definition

a rapidly spinning neutron star that emits radio waves

A Rapidly Spinning Neutron Star That Emits Radio Waves.

Pulsar

Pulsar Simple Definition

the very bright center of a distant galaxy

The Very Bright Center Of A Distant Galaxy.

Quasar

Quasar Simple Definition

a stream of electrically charged particles released by the Sun’s corona

A Stream Of Electrically Charged Particles Released By The Sun’s Corona.

Solar Wind

Solar Wind Simple Definition

the bright explosion of a dying supergiant star

The Bright Explosion Of A Dying Supergiant Star.

Supernova

Supernova Simple Definition

everything that exists, including the stars, planets, and energy

Everything That Exists, Including The Stars, Planets, And Energy.

Universe

Universe Simple Definition

the hot dense core of a star left behind when its outer layers have escaped into space

The Hot Dense Core Of A Star Left Behind When Its Outer Layers Have Escaped Into Space.

White Dwarf

White Dwarf Simple Definition

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