Category 1
Difference between a solar and lunar new year
Solar - Based off of Sun
Lunar - Based off of Moon
A rocky sphere that travels around a planet
The Moon
The ___ does not make it's own light; the Sun illuminates the Moon
Moon
Which was not one of the four elements the ancient Greeks believed comprised the world?
Spirit
Who developed the telescope?
Galileo Galilei
Where does the Moon get light from?
The Sun
To shine light on an object and make it visible
Illuminate
When a model is to scale, object sizes and distances are larger or _____ than in the real world
Smaller
When did scientists first measure the motion of groups of moving galaxies?
1930
A light year is the _____ light travels in a year
Distance
How much of the Earth is illuminated at a time by the Sun?
About 50%
The star that is the main source of light at the center of our system
The Sun
Some ____ need to be not to scale to be useful
Models
The universe's expansion seems to be ________.
Accelerating
The Milky Way is a ____ galaxy
Spiral
What is a model that is to scale?
The relative size of thingss
Scale
The Sun _____ the half of the Moon that it is facing, and the other half is dark
Today's best measurements estimate that about ___% of the universe is dark matter.
27
Galaxies fly ____ from one another because the universe is still expanding
Away
When would we use a model that is not to scale?
An object diagram or computer program that helps us understand something
Model
Light from the Sun travels in _____ lines
Straight
Why is the universe still expanding
Lasting momentum from the Big Bang
Molecules are made of smaller parts called ____
Electrons