Post on 23-Feb-2016
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How Big?A LOOK AT THE SIZE OF THE UNIVERSE
Name some of the objects we have talked about…
How big are each of them. Lets put these into order from largest to smallest.
Are there any other items to add to the list?
The Universe
How big is the universe? Do we really know… Observable Universe
13.7 billion light years across. How do we know this?
Stellar parallax measurements and calculations based on red shift.
Galactic Clusters
Super Clusters Groups of Groups of galaxies
Some argue that these are the biggest things in the universe, but we know better!
Regular cluster A grouping of galaxies 100 billion times the volume of the Milky
Way
Super Cluster
We are part of the Virgo Super Cluster
This is BIG!!!! These groupings stick
together under their own gravitational attraction
Made of many smaller groups of Galaxies
Regular Galactic Clusters
We are a part of what we call “Local Group”
There are at least 28 galaxies in our local group.
Galaxies
Milky Way 100,000 Light years across and
10,000 light years thick This one is ours Spiral shaped
Other galaxies take on different shapes for many different reasons
Made of stars
Nebulas
In my estimation, some of the most beautiful things in the universe
Clouds of gas that are left after a star goes out
Gravity pulls some together from surrounding areas
Stars
Huge range in size and color From 1500 times the size of the
sun to only slightly larger than Jupiter
From dull brown all the way up to bright blue
Gas Planets Jupiter, Saturn, Neptune, Uranus Planets that orbit a star and are
made of mostly gas. Typically quite large compared
to Earth. Tend toward the outside of a
system
Rocky Planets Mercury, Venus, Earth, and Mars Smaller than the gas giants Surfaces hold at least some
atmosphere Made of solid materials
Moons
There are to many to name here. Suffice it to say that there are many and they are varied.
Comets and Asteroids Majority of our asteroids
are in the Asteroid belt. Small chunks of rock left
over from the formation of our Solar System
Comets- chunks of ice and dirt that orbit our Sun out into deep space.
Gas and Particulates