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Space....the final frontier??

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dayle westhora

on 11 April 2018

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Transcript of Space....the final frontier??

What is Astronomy?
1. Astronomy is the study of objects in the Universe

2. Astronomers study the Universe using telescopes, satellites, probes, as well as manned and unmanned space flights
What’s in the Universe?
1. Galaxies
2. Stars
3. Solar systems
4. Planets and their moons
5. Asteroids
6. Comets
7. Nebulas
The Origin of the Universe
1. Astronomers believe that about
15 to 20 billion years ago all the matter and energy in the Universe were concentrated into one point
called a singularity
2. Tremendous amounts of
heat and pressure made this point so unstable that it exploded
The Big Bang Theory
1. The Big Bang Theory states that the Universe
began to expand after an enormous explosion
of concentrated matter and energy
2. After the initial explosion,
gravity pulled the matter into huge clumps which formed the galaxies
3. Even as the galaxies were forming, everything continued to race outward,
expanding the Universe
The Fate of the Universe
Background radiation, left over from the Big Bang, has led astronomers to two possible fates for the Universe
Open Universe
- A universe that would continue to expand
Closed Universe
- A universe that would expand then collapse back in on itself
An Open Universe Theory
1. A possible future where the galaxies continue racing outward, expanding the Universe
2. Stars would eventually die off as the last of their energy was released
3. After billions of years there would be nothing left of the Universe
The Solar System
A huge rotating system consisting of the Sun, eight planets and their satellites, dwarf planets, asteroids, comets, and meteors
Astronomers use the Nebular Theory to explain the formation of our solar system
The Planets in the Solar System
The eight planets in the Solar System, named in order of increasing distance from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, & Neptune
Astronomers use
various criteria to
group the planets
Inner vs. Outer Planets
The asteroid belt is used as a dividing line to separate the planets into two groups
inner planets (Terrestrial)
- Mercury, Venus, Earth and Mars
A. between sun and asteroid belt
B. solid rocky surface
outer planets (Jovian)
- Jupiter, Saturn, Uranus, and Neptune
A. beyond the asteroid belt
B. gaseous surface
Terrestrial vs. Jovian Planets
Terrestrial Planets
- Planets that are Earth-like, in that they have a solid, rocky surface... Mercury, Venus, Earth, and Mars

Jovian Planets
- Planets that are Jupiter-like, in that they are primarily made of gas...Jupiter, Saturn, Uranus, and Neptune
A Closed Universe Theory
1. The expansion of the Universe would eventually come to a halt
2. Gravity would begin to pull the galaxies back toward the center of the Universe
3. After many billions of years, all the matter and energy in the Universe would again be concentrated in a single point
4. A new “Big Bang” could occur every 80 to 100 billion years
The Nebular Theory
1. According to the nebular theory, our solar system
began as a great cloud of dust and frozen gases
2. About
5 billion years ago this rotating cloud began to contract
3. As the nebula contracted,
it spun faster and flattened itself into a disk shaped cloud
4. Compression of the matter in the center of the cloud ignited the
located there,
forming the Sun
The remaining material

orbiting the Sun collected into a number of huge whirlpools that eventually

became the planets and their moons
Eagle Nebula - 7,000 light years away; about 5.5 million yrs old
Picture of the Nebular Theory
Full transcript