The Galaxy
What are the three things that make up a galaxy?
Stars, dust and gas
What materials form the inner planets?
heavier rocky and metallic pieces
What 2 things does the strength of gravity rely on?
mass and distance between objects
All stars starts as
a nebula or a cloud of gas and dust
the outer planets are called the ________ giants
gas
What holds a galaxy together?
gravity
Which planet has the longest orbit?
Neptune
Two planes are flying so that the gravitational pull between them is decreasing. What direction are they flying?
away from each other
When is a start born?
when nebula gets so hot that nuclear fusion starts
What shape are elliptical galaxies?
oval
Put the steps in order
1. the sun was formed
2. Big Bang
3. a gigantic cloud of gas and dust collapsed
2, 3, 1
Mars has a 24 hour, 31 minute day and earth has a 23 hour and 56 minute day. They have similar ________________
Rotations
You would find the least gravitational pull on which of these? Earth, Mars, Jupiter
Jupiter
What determines the life cycle of a star?
a. it's shape
b. how close it is to other stars
c. it's mass
it's mass
What makes up our solar system?
our planets and sun
What type of galaxy do we live in? Irregular, spiral or oblong
spiral
What is the relationship between the Earth and the milky Way?
it is located in the milky way but far from the galaxy center
Does an object with greater mass have more or less gravitational pull on other objects?
More
what two elements make up new stars and give them energy?
hydrogen and helium
Group of planets in our solar system that don't meet requirements to be called a planet
dwarf planets
Galaxies are sorted into different categories based on their
age shape density location
shape
Which is true?
a.orbital period of a planet is related to distance from sun or
b.planets that have the shortest rotation are closest to sun
a
What 2 forces cause small objects in space to orbit larger objects in space? (moon around the earth)?
gravity and inertia
What are 2 of the 3 possible things that stars can become when they die?
black dwarf, black hole or neutron star
Where is the Kuiper Belt?
Beyond Neptune