Gravity
This force keeps planets in orbit around the Sun.
gravity
Earth is located in this “just right” zone around the Sun that allows liquid water to exist.
What is the habitable zone (or Goldilocks zone)?
This is the center of our solar system.
sun
The strength of gravity depends on these two factors.
mass and distance
This essential molecule covers about 70% of Earth’s surface and is required for all known life.
water
These rocky objects orbit between Mars and Jupiter.
Asteroids
The Moon orbits Earth because of this planet’s gravitational pull.
Earth’s gravity?
Earth’s atmosphere is unique because it contains this gas that humans need to breathe and is 20% of the atmosphere.
Oxygen
These icy visitors develop tails when they get close to the Sun.
comets
The Sun has the greatest gravitational pull in our solar system because it has the most of this.
mass
Without this invisible blanket of gases, Earth would be too cold to support life.
atmosphere
This region beyond Neptune is home to dwarf planets like Pluto and many icy bodies.
Kuiper belt
What would probably happen to the Moon if gravity did not exist in the solar system?
Go away in a straight line
Name three main features that allow life on Earth
(1)_Atmosphere contains Organic compounds_, .
(2)_Presence of water in all phases_____
(3) Climate (moderate temperature)
(4)_Proximity (distance) to sun___
(5) _Length of sunlight for photosynthesis
This distant, spherical shell of icy objects is believed to surround our solar system and be the source of long-period comets.
Oort Cloud