Inner Planets
Which inner planet(s) have known water
Mars and Earth
Which Outer planet has a red spot
Jupiter
Define ellipse
the casting of one celestial body's shadow on the surface of another celestial body
what is the asteroid belt
the imaginary line that separates the inner planets from the outer planets
Who discovered the laws of Gravity and motion
Isaac Newton
Which inner Planet(s) have the weakest gravity
Mercury and Mars
Where is Pluto located
In the Kuiper Belt
define aphelion
the point in a planet's orbit when it is farthest from the sun
What is the Kuiper belt
what separates Pluto from the rest of the planets
Which inner planet(s) have the weakest gravity
Mercury and mars
Which inner planet's year is the longest
Earth
Which outer planet has the longest day
Uranus
define perihelion
the point in a planet's orbit when it is closest to the sun
why is Pluto not considered a planet
because it is in the Kuiper belt and is too small
Who discovered the heliocentric world view
Nicolaus Coperincus
Which inner planet has the longest day
Venus
which outer planet has the longest year
Neptune
define astronomical unit
the average distance between Earth and the Sun
what does retrograde mean
the planet spins backwards
which inner planet(s) has the strongest gravity
Earth
What do all the inner planets have in common
They are smaller and have solid surfaces
What do the outer planets have in common
They have no solid surface, larger, all have rings, and beyond the asteroid belt, ect.
why is gravity important in the solar system
without gravity the planets would fall out of their orbit and most likely run into each other or the sun
which planets spin retrograde
Uranus and Venus
who made three laws about planetary motion
Johannes Kepler