Ch4 sec1 the nine planets
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
