ELIFE LESSON 1 / ORIGIN OF THE UNIVERSE & SOLAR SYSTEM

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Universe

Is everything that exists — all space, time, matter, and energy.

Universe

It contains billions of galaxies, including our own.

Universe

The entire “container of everything.”

Galaxy

A massive system of stars, gas, dust, and dark matter.

Milky Way

The specific galaxy we live in.

Milky Way

A spiral galaxy with about 100-400 billion stars.

Solar System

A small part of the Milky Way.

Solar System

This includes the Sun, 8 planets, moons, asteroids, and comets. Everything in it orbits the Sun.

Big Bang Theory

A theory first developed in 1927.

Big Bang Theory

The widely accepted scientific theory that explains the origin of the universe.
Space, time, energy, and matter are created after event.

Georges Lemaitre

He developed the Big Bang Theory in 1927.

Georges Gamow

He coined and revised the Big Bang Theory.

Big Bang Theory

No explosion happened, only a continuous expansion or inflation of the universe.

Singularity

An intensely hot and infinitely dense object that suddenly inflated and that started the beginning of the universe.

Ralp A. Alpher

Relict radiation or radiation remaining from the Big Bang Theory was made in 1948.

Robert Wilson & Arno Penzias

American radio astronomers. They accidentally discovered the CMB in 1965. They were awarded the Nobel Prize in 1978.

Cosmic Microwave Background Radiation

The remnant of the early universe 380,000 years after its creation. It is everywhere in the universe. It is invisible to humans because it is so cold.

13.8 billion years old

The discovered age of the universe.

Steady State Theory

This theory states that the universe is always expanding at a constant average density.

Steady State Theory

This theory claims that the universe has no beginning or end.

Hermann Bondi, Thomas Gold, and Fred Hoyle

They proposed the Steady State Theory in 1928.

Nebular Hypothesis

Around 4.6 billion years ago, the solar system was formed from a rotating gas cloud or nebula of extremely hot gas.

Nebula

A giant cloud of dust and gas in space.

Planetesimal and Tidal Theory

This was developed by Thomas Chamberlin and Forest Moulton during the early 20th century, and James Jeans and Harold Jeffreys in 1918.

Planetesimal Theory

This is a theory on how the planets are formed.

Tidal Theory

A star passed close enough to the sun, creating a huge tides and causing materials to be ejected.

Terrestrial Planet

This is also called the Inner Planet.

Terrestrial Planet

This is the Mercury, Venus, Earth, and Mars.

Terrestrial Planet

Smaller planets; closer to the sun.

Jovian Planet

This is also called the Outer Planet.

Jovian Planet

This is Jupiter, Saturn, Uranus, and Neptune.

Jovian Planet

Bigger and gaseous planets; have a great distance to the sun.

Earth

This is the third planet from the Sun with a distance of about 93 Million Miles (149 million km)

Oblate Spheroid

The shape of the earth.

Gravity and Rotation

How the Earth got its present shape.