Lesson 2: The Solar System

Question 1

This is the center of the solar system

Answer 1

Sun

Question 2

The sun mostly consists of these 2 elements

Answer 2

hydrogen and helium

Question 3

This is the process that releases the Sun’s energy.

Answer 3

nuclear fusion

Question 4

The sun accounts for __% of our solar system’s mass

Answer 4

99%

Question 5

What is the biggest planet in the milky way?

Answer 5

Jupiter

Question 6

What are the 8 planets

Answer 6

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Question 7

This is known as the dwarf planet

Answer 7

Pluto

Question 8

What are the planets that don’t have moons?

Answer 8

Mercury and Venus

Question 9

How long does it take for the earth to travel around the sun?

Answer 9

365 days

Question 10

How many moons does Jupiter have?

Answer 10

63

Question 11

Moons are called natural _____

Answer 11

satellites

Question 12

A regular, repeating path that one object in space takes around another one.

Answer 12

orbit

Question 13

What do planets orbit?

Answer 13

Sun

Question 14

This theory suggests that the universe began with a huge explosion

Answer 14

The Big Bang Theory

Question 15

When was the universe created?

Answer 15

10-15 billion years ago

Question 16

When was the Sun and the other planets created?

Answer 16

5 billion years ago

Question 17

When did earliest life forms appear on earth

Answer 17

3.8 billion years ago

Question 18

The earliest plants and animals appeared _______ years ago

Answer 18

700 million

Question 19

When did dinosaurs become extinct?

Answer 19

65 million years ago

Question 20

When did modern humans appear

Answer 20

100,000 years ago

Question 21

In 150 AD, who suggested that the Sun is the center of the Solar System?

Answer 21

Ptolemy

Question 22

In 1533 AD, who created a model of the solar system in which the Sun is at the center and the planets move in circles?

Answer 22

Copernicus

Question 23

Did the planets spin in Copernicus’ model?

Answer 23

No

Question 24

A book that suggests planets move in elliptical orbits

Answer 24

Astronomia nova

Question 25

Who published the Astronomia nova?

Answer 25

Johannes Kepler

Question 26

Who pioneered the use of the telescope?

Answer 26

Galileo Galilei

Question 27

This was launched to provide views that cannot be seen by regular telescopes

Answer 27

Hubble Space Telescope

Question 28

What is the shape of the planets' orbit?

Answer 28

Elliptical

Question 29

In which direction do planets revolve around the sun?

Answer 29

counterclockwise

Question 30

Two kinds of planets

Answer 30

Terrestrial and Jovian

Question 31

Which planets are terrestrial?

Answer 31

Mercury, Venus, Earth, Mars

Question 32

Which planets are Jovian

Answer 32

Jupiter, Saturn, Uranus, Neptune

Question 33

Are craters seen on jovian planets?

Answer 33

No. They don’t have a solid surface.

Question 34

(T/F) All jovian planets have rings.

Answer 34

true. Not only Saturn

Question 35

Small objects made of rocks that evolve around the Sun. They are also known as planetoids or minor planets.

Answer 35

Asteroids

Question 36

Mostly in highly elliptical orbits, occasionally coming close to the Sun

Answer 36

Comets

Question 37

Small dust grains throughout the solar system

Answer 37

Meteoroids

Question 38

meteoroid that enters the Earth's atmosphere that produces a streak of light

Answer 38

Meteor

Question 39

portion of meteoroid or asteroid that hits the ground without being destroyed

Answer 39

Meteorite

Question 40

A swarm of trillions of comet nuclei

Answer 40

Oort cloud

Question 41

These are natural objects that orbit around the planets.

Answer 41

Satellite

Question 42

It is a motion opposite to the Earth and other planets’ turn.

Answer 42

Retrograde

Question 43

It is a disc-shaped region of icy bodies including dwarf | planets and comets beyond the orbit of Neptune.

Answer 43

Kuiper Belt

Question 44

It occupies the orbit between Mars and Jupiter which | is made of rocks and stone.

Answer 44

Asteroid Belt

Question 45

What theory: Hydrogen and other gases swirled around and condensed into our Sun and planets

Answer 45

Nebular hypothesis

Question 46

What theory: One day the sun burst open and planets and moons shot out and went to their respective places

Answer 46

Fission theory

Question 47

What theory: Planets and moons were flying around and they were captured by the Sun

Answer 47

Capture theory

Question 48

What theory: space dust and rock chunks formed the planets and moons.

Answer 48

Accretion theory

Question 49

What theory: Our world collided with a small planet and the rocks from the explosion became the moon

Answer 49

Planetary Collision theory

Question 50

What theory: Our planets, moon, and stars spun off from the collision between stars

Answer 50

Stellar Collision theory

Question 51

What theory: Gas clouds were captured by the Sun and became planets and moons

Answer 51

Gas Cloud theory

Question 52

Planet formation starts with clumping together of grains of solid matter:

Answer 52

planetesimals

Question 53

Planetesimal grow through ______ and _______

Answer 53

condensation and | accretion

Question 54

Which model of the Solar System says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it

Answer 54

Geocentric model

Question 55

Which model of the solar system consider the sun as the center, and the planets revolve around the sun

Answer 55

Heliocentric model