Ch4 sec1 the nine planets

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Up until the 17th century which eight bodies were thought to make up of the universe

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Sun, Earth's moon

What planets are in the inner solar system

Mercury Venus Earth and Mars

The amount of time it takes light to travel around the earth 7 1/2 times is

1 second

How many planets are in the inner solar system

4

How many planets are in the outer solar system

5

How many light minutes are there in one astronomical unit

8.3 light minute

Which famous 17th century scientist use a telescope to explore the sky

Galileo

Is earth part of the inner or outer solar system

Inner

Which planets are called terrestrial Which planets are called gas giants

Inner Outer

Outer solar system

Jupiter Saturn Uranus Neptune Pluto

The distance light travels in one minute is called a

Light min

Ancient astronomers knew that planets were

Physical bodies

What is the only planet of the outer solar system that a small dents in rocky

Pluto

Which was the last planet discovered during the 20th century

Pluto

What makes up the Saturn system

Saturn and the several moons that orbit Saturn

The sun and the planets and many smaller bodies make up the

Solar system

What scientific instrument first made it possible to study the stars and planets

Telescopes

The inner planets are also called ___ planets because they're surfaces are dense and rocky

Terrestrial

The average distance between earth and the sun is

The astronomical unit

Which new bodies were discovered during the 17th century after the telescope was introduced

The moons of Jupiter and Saturn

Another way to measure the distance is in space is by using

The speed of light

Why are most of the outer planets called gas giants

There are large and composed of mostly gases

What does the word planet mean

Wanderers


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