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The Cosmic Engine. Mercury. Planets. Venus. Earth. Gravity. Mars. Powered by nuclear reactions. Sun is a star. Jupiter. Solar System. Saturn. Uranus. Neptune. Millions of stars (suns). Milky Way. Stars orbit galactic centre. Galaxy. Gravity. Billions of galaxies. Universe.

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Mercury

Planets

Venus

Earth

Gravity

Mars

Powered by nuclear reactions

Sun is a star

Jupiter

Solar System

Saturn

Uranus

Neptune

Millions of stars (suns)

Milky Way

Stars orbit galactic centre

Galaxy

Gravity

Billions of galaxies

Universe

Universe is expanding

scale of the universe
Scale of the Universe

http://primaxstudio.com/stuff/scale_of_universe/

a little history
A Little History

Up until 200 years ago, it was all about the solar system.

1500 year battle over geo-centric vshelio-centric

Geo-centric: Geo = earth Centric = centred around

Everything revolved around the Earth

Helio-centric: Helio = sun Centric = centred around

Everything revolves around the sun

it all started with aristotle aristarchus
It all started with Aristotle & Aristarchus

~330BC

Aristotle: Philosopher – Sun, moon, planets & stars orbit Earth on crystal spheres

Geo – centric

~240BC

Aristarchus: Philosopher – Earth & planets orbit the sun on crystal spheres, stars are on a fixed sphere very far away.

Helio– centric

claudius ptolemy 120ad
Claudius Ptolemy - ~120AD

Geo-centric

It explained retrograde motion of planets

Based on evidence, not philosophy

It worked!

It became part of religious doctrine

nicholas copernicus 1473 1543
Nicholas Copernicus 1473 - 1543

Helio-centric model – Earth & planets orbit the sun on crystal spheres

It was simpler, and possibly more “correct”, but it didn’t work any better, therefore it was largely rejected.

Also rejected for religious reasons