Physics
A force that pulls objects with mass towards each other
What is gravity?
An object spinning around its axis
Rotation
The average distance from Earth to the sun is considered one _________________________
Astronomical Unit
Celestial objects that: 1. are too small to clear their nearby area in space; 2. have a weak gravity; 3. still orbit the sun
Dwarf planets
How long does it take the Earth to complete a revolution
(Newton's First Law) An object at rest stays at rest; an object in motion stays in motion, unless...
Acted upon by an outside force!
An object completing a full orbit
Revolution
The four planets closest to the sun are considered "Earth-like" planets, aka:
The Terrestrial Planets
Huge chunk of irregularly shaped rocks, mostly located in between the inner four and outer four planets
Asteroids
How long does it take the Earth to complete a rotation?
24 hours
(Newton's Second Law) The greater the force, the greater the acceleration; The greater the mass, the greater the ____________ needed to cause the same acceleration
Force!
The invisible line running between Earth's north and south pole
Axis
The four planets furthest from the sun are not made of rocky material, but have a very loose structure because they are mostly made of...
Gases
"Dirty snowballs" - made of dust and rock particles with frozen gases; they orbit the sun
Comets
The sun appears to rise in the __________ and set in the _________.
Rise: East; Set: West
(Newton's Third Law) For every action force, there is an equal and __________________ reaction force
Opposite
A repeating path an object takes around a center of gravity
Orbit
The hottest planet in our Solar System, with lots of active volcanoes
Venus
A meteoroid that enters the Earth's atmosphere and burns up from friction
Meteors (shooting stars)
Earth's axis is pointed towards
Polaris (North Star!)
If you weigh 120 pounds on Earth, and travel to the moon, approximately how much would you weigh?
Moon = 6x less gravity
120/6 = 20 pounds
How heavy an object feels due to gravity
Weight
This planet has the strangest rotation around it's axis- it rotates as though it has been flipped sideways (unlike the other planets!)
Uranus
A combined "Lab" and "apartment" for astronauts
Space Station!
Earth rotates in a ___________________________ direction