Gravity
Gravity causes cast off gases to clump together to begin forming new _____ and ______.
stars and planets
the inner planets are mostly ______ in size
smaller
the outer planets are mostly _____ in size
larger
What galaxy do we live in?
milky way
Put in order from BIGGEST to SMALLEST
galaxy, solar system, universe, planet
a huge collection of gas, dust, and stars held together by gravity
nebula
the inner planets have mostly a ______ surface
rocky or terrestial
the outer planets have mostly a ____ surface
gaseous
A galaxy that has a shape similar to an avocado is a(n) _____ galaxy
elliptical
What is the shape of all planets' orbits?
elliptical
the strength of gravity depends on _____ and ______
distance and mass
none of the inner planets have ______
rings
unlike the inner planets, all of the outer planets have _______
moons
Name the 3 types of galaxies
elliptical, spiral, and irregular
Which planet has the largest Moon and what is its name?
Jupiter - Ganymede
As the solar system cooled and developed, larger bodies were pushed _______ by gravity.
towards the center
Why are Mars and Earth so similar?
both contained water at one time
Name the outer planets from closest to the Sun to farthest away
Jupiter, Saturn, Uranus, Neptune
galaxies are made up of ....
dust, gas, stars, planets, solar systems, dark matter, black holes
What 2 pieces of information would you need to accurately make a model of the planets in our solar system?
Their size and distance from the Sun
gravity and _____ work together to keep the planets in orbit around the Sun
inertia
Name the inner planets in order from the Sun
Mercury, Venus, Earth, Mars
Why is Pluto no longer a planet?
Scientists changed the definition of a planet based on new information
the closest galaxy to us is...
Andromeda
Give 3 facts about our Sun. Be sure to include the words galaxy and mass in some of your facts.
1. It is in the center of our SOLAR SYSTEM
2. It is a star (one of billions in the UNIVERSE)
3. It contains about 99% of the mass of our SOLAR SYSTEM
4. It is part of Milky Way GALAXY