When was the Solar System formed?
4.6 billion years ago
From what?
a giant interstellar molecular cloud.
What is the Solar System?
a gravitationally bound system comprising the Sun and the objects that orbit it,
What are the largest eight things orbiting the sun?
planets
What are some of the smaller things?
dwarf planets
Where is most of the Solar System's mass?
the Sun
Which planet has most of the rest of the mass?
in Jupiter.
How many inner planets are there?
Four
What are two of them?
, Mercury, Venus
What are the other two?
Earth and Mars,
What kind of planets are they?
terrestrial planets,
What are they mostly made up of?
rock and metal.
Which planets are the ice giants?
Uranus and Neptune,
Which are gas giants?
The two largest,
What are there names?
Jupiter and Saturn,
How many outer planets are there?
The four outer planets
What kind of orbit do all of the eight planets have?
lmost circular
Which things orbit the sun indirectly?
.moons
What are Uranus and Neptune made up of mostly?
substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
What is the name for the nearly flat disc?
the ecliptic.