Astronomy

History of Astronomy and Big Bang theory

Ptolemy’s Model of the solar system

Earth is in the center

The three Giza pyramids

Allegedly Aligned with Orion

What animal is the pyramid of Chichén Itzá in equinox

A snake

Greek astronomers

Eratosthenes, Aristotle, Ptolemy

The first astronomic models

Earth at the center of the universe

Who measured the size of the Earth

Eratosthenes

How was the circumference of the earth found

With trigonometry and sundials

Why is Ptolemy’s Geocentric model not accepted

Kepler showed that Heliocentric was accurate

What did Ptolemy use to explain retrograde in motion

Epicycles

Nicholas Copernicus

Developed heliocentric model, placed the sun in the center of the solar system, was a polish mathematician.

Ptolemy and Copernicus were wrong

The planets orbit in perfect cycles

Galileo

Discovered jupiters 4 large moons, discovered Saturns rings, discovered stars

Keplers first law of Planetry motion describes planets orbit as

Elliptical

How was the Crab Nebula formed?

From a supernova observed in 1054 by the Chinese

Who developed the Zodiac

Babylonians

Why was Galileo put on trial?

He was charged with heresy for advancing heliocentric theory

What can exert a gravitational force?

Anything with mass

How does distance affect gravity?

The closer two objects are, the stronger the gravitational force

How far is the Solar System from the center of the Milky Way

30 thousand light years

Hubble Law

Galaxies farther away are moving faster away from us

Who discovered the first galaxy other than the Milky Way?

Edwin Hubble

Why are Cepheid variable stars importat to astronomy

to help us measure longs distances in the universe

Ver Rubin’s Team discovered “invisible glue” that is…

Dark matter

How do we know dark matter exists

stars have greater velocities than they should in the edge of galaxies.

dark matter

force to keep galaxies together

Michelson Morley experiment

Light travels though medium called ether

general Theory of Relativity

• gravity is a warping of spacetime

• time slows down at high speeds (closer to speed of light

“Grain of sand helt at arm”

James webb Glaxies

How man voyager spacecrafts did NASA send to travel furthers areas than our Solar system

2

Red SHifted Star Spectrum

Star is moving away from earth

what supports Big Bang Theory?

Compositions of meteorites

spectrum form distant galaxy

Blue Shift

the universe is…

13.7 billion years

Doppler effect

Change is frequency or wavelenght due to a moving source of sound waves

discovered by Hubble 1929

the universe is expanding

Hubbles law states that

Galaxies are moving away from us and eachother

Cosmic Microwave Background

Leftover heat from big bang

Big Band creates..

Lightes elements, helium and hydrogen

Elements of a star

Hydrogen and Helium

Helium

Hydrogen nuclei in the core of a star are fused and become

Kuiper Belt

Outside of Neptune,

• Pluto

• MakeMake

• Eris

Thermonuclear fusion

Combining two atoms by heat