Astronomy

How would you define this term?

Astronomy

The study of everything beyond

Earth!

What do we call the overall place where we live?

The Universe

Universe

Definition:

All of space and what is found in it.

Order of the Universe Parts from largest to smallest?

Order of the Universe?(Place the following from largest to smallest?)

Planet Sun’s Neighbors Local Group/Cluster Star Natural Satellite Solar System Galaxy Universe Super Cluster

UNIVERSE

Universe All of space and

what is found in it.

Full of 100 billion galaxies with 100 billion stars each.

Super Cluster

Super Cluster A collection of

galaxies which includes the Local Group (A Cluster).

Largest gravitational bound system so far.

Ours=Virgo Super Cluster

Cluster

Cluster Ours :

- Local Group – The Milky Way Galaxy and its ~50 closest neighbors.

A small group of galaxies which are held together by gravity and orbit each other.

“Local” means the galaxies are within a region 3 million light years across.

Galaxy

Galaxy A vast collection

of stars, gas, and dust held together by gravity.

Ours =

Milky Way

Sun’s Neighbors

Sun’s Neighbors The sun and its

20 closest neighboring stars.

Our closest stars are: Alpha Centauri, Proxima Centauri

( 4 LY Away )

Solar System

Solar System* A group of planets and

other celestial bodies that orbit a star.

Ours:

The sun and its collection of 8 planets.

Star A hot, glowing globe of

gas that emits energy. It radiates a huge

amount of energy in the forms of light and heat.

Ours = The Sun

Planet

Planet An object that

revolves (orbits) around a star.

Ours = The Earth

Natural Satellite

Natural Satellite An object that

revolves around a planet

Ours =

The Moon

What is the order?(Largest to Smallest)

U___________ S___________ C__________ C ___________ G___________ S___________ N___________ S___________ S___________ S___________ P___________ N___________ S___________

Order of the Universe(Proper order from largest to smallest.)

Universe Super Cluster Local Group/Cluster Galaxy Sun’s Neighbors Solar System Star Planet Natural Satellite

You now know the parts and order of

the universe!

What an astronomical task you have

accomplished!!!