Term 2 Intro: The Beginning of Earth

Question 1

1 Light Year

Answer 1

9.46 trillion km.

Question 2

Evolution of Life on Earth: Early Earth

Answer 2

4.5 bya.

Earth was too hot for liquid water.

Atmosphere full of toxic gases from volcanoes.

Question 3

Evolution of Life on Earth: 3.85 bya

Answer 3

Planet cooled enough to form seas, all fresh water.

Continents different shapes.

Question 4

Evolution of Life on Earth: Current Oceans

Answer 4

Salinity accumulated from leeching of minerals from continents & sea floor.

Took 100 million years to become salty.

Question 5

Planets: Earth

Answer 5

Terrestrial planet.

Mantle (rock).

Solid Fe/Ni outer core.

Liquid Fe/Ni inner core.

Question 6

Planets: Jupiter

Answer 6

Jovian/ giant gas planet.

H2 gas.

Metallic hydrogen.

Rock & ice core.

Question 7

Planets: Uranus

Answer 7

Ice giant planet.

Mantle (H20, NH3, CH4, Ices).

Atmosphere (H2, He, CH4, gas).

Rock core.

Question 8

Planets: The Habitable Zone

Answer 8

AKA Goldilocks Zone.

Sun > mercury > venus > earth > mars > jupiter > saturn > uranus > neptune.

Question 9

Current Age

Answer 9

4.6 billion years.

Question 10

Nebulae

Answer 10

Birth & death of stars, creation of elements that make up life.

Question 11

Closest Planet Resembling Earth

Answer 11

Proxima b.

4 light years away.

Question 12

Kepler Mission

Answer 12

Finding habitable exoplanets.

5000+ found, 61 meeting conditions.

Question 13

Drake Equation

Answer 13

N= R(*) x F(p) x n(e) x F(l) x F(i) x F(c) x L

New empirical constraint on prevalence of technological species in the universe.