Solar System: ABOUT SUN AND THE EIGHT PLANETS AND SPACE SATELLITES

Question 1

A planet with a solid, inner core is...

Accepted Answer

a terrestrial planet

Question 2

Which planet is considered to be Earth's "twin" due to their similar size?

Accepted Answer

Venus

Question 3

In ancient times, people believed that all objects in the Universe revolved around the Earth. This was called the...

Accepted Answer

geocentric theory

Question 4

A small, rocky object that orbits the Sun (mostly between Mars and Jupiter).

Accepted Answer

Asteroid

Question 5

A planet that is made of lighter elements which are gasses is a...

Accepted Answer

a gas giant.

Question 6

What factors influence the strength of attraction (gravity) between two objects?

Accepted Answer

mass and distance

Question 7

_____ describe how the planets move and behave.

Accepted Answer

Kepler's Laws

Question 8

A ___ is entering Earth's atmosphere (shooting star). A ___ has hit the surface.

Accepted Answer

meteor; meteorite

Question 9

The __________ is made of several parts: the sun, eight planets, and numerous smaller objects that orbit the Sun.

Accepted Answer

Solar System

Question 10

Smaller, planet-like objects, sometimes called protoplanets, with debris fields are called...

Accepted Answer

dwarf planets

Question 11

There are four terrestrial planets. They are:

Accepted Answer

Mercury, Venus, Earth, Mars

Question 12

Who first discovered that the Earth, and all other planets, revolve around the Sun?

Accepted Answer

Nicolaus Copernicus

Question 13

Which nation launched the first space station?

Accepted Answer

the Soviet Union (Russians)

Question 14

What distinguishes Earth from other planets in our Solar System?

Accepted Answer

presence of water in all three states of matter

Question 15

A small, icy object that develops a glowing tail as it nears the Sun.

Accepted Answer

Comet

Question 16

What is the smallest planet in our Solar System?

Accepted Answer

Mercury

Question 17

What was the first human-made object to travel outside our Solar System?

Accepted Answer

Space Probe Voyager I

Question 18

A _____ is an object that orbits a star, has a round shape, and does not have a debris field.

Accepted Answer

planet

Questions 18