| A | B |
|---|
| galaxy | is a group of stars, gas, and dust held together by gravity |
| universe | contains all galaxies, stars, and space. |
| Visible light | Which type of electromagnetic wave do humans see with their eyes |
| Ultraviolet light | Which has a higher frequency: microwaves or ultraviolet light? |
| 100 years | If a star explodes 100 light-years away, how long will it take before we see the explosion from Earth? |
| The Milky Way Galaxy | Which galaxy is Earth located in? |
| Space distances are so large that light-years (the distance light travels in one year) make the easier to describe than miles | Why do scientists use light-years instead of miles to measure distances in space? |
| If a star is 5 light-years away, the light we see left the star 5 years ago. | If a star is 5 light-years away, what does that tell us about the light we see from it today? |
| A galaxy has billions of stars. | How many stars are estimated to be in one galaxy? |
| smallest - planet, star, solar system, galaxy, universe - largest | Place these in order from smallest to largest: galaxy, universe, star, solar system, planet. |
| Radio waves have a longer wavelength than X-Rays. | Which has a longer wavelength: radio waves or X-rays? |
| Wavelength and frequency are opposites: as wavelength increases, frequency decreases. | How are frequency and wavelength related? |
| Technology allows us to see and measure places humans cannot travel (like distant planets, the Sun, or deep space). | Why is technology essential for scientists to study areas like deep space or the bottom of the ocean? Give an example. |
| Space distances are so large that light-years (the distance light travels in one year) make them easier to describe than miles. | Why do scientists use light-years instead of miles to measure distances in space? |
| Because the universe contains billions of galaxies, each with billions of stars - the Sun is just one of many | Why is it correct to say that the Sun is just one of many stars in the universe |
| galaxy is a group of stars, gas, and dust held together by gravity. The universe contains all galaxies, stars, and space. | What is the difference between a galaxy and the universe? |
| galaxy is a group of stars, gas, and dust held together by gravity. The universe contains all galaxies, stars, and space. | How does gravity keep the planets in orbit around the Sun? |
| Mass and Distance | What two things help determine gravity? |
| Reflecting Telescope | Which type of telescope uses a mirror? |
| Refracting Telescope | Which type of telescope uses lenses to allow us to see distant objects? |
| the speed of light in the vacuum of space | What is used to measure a light-year? |
| Disc-shaped | What type of galaxy is our Sun located in? |
| light-years | What is used to measure distances of objects in different solar systems? |
| spiral galaxy | What type of galaxy has arms that sprial out from one central bulge that is oval shaped? |
| gravity | What keeps our planets in orbit and keeps then from shooting off into space? |
| gravitational attracting decreases | What happens to gravitational attraction as a planet moves farther away from its star? |
| gravitational attracting increases | What happens to gravitational attraction as a planets orbit moves it closer to its sun? |
| Planets have different masses. | Why do planets orbit at different speeds? |
| frequency | What is the number of crests that pass through a point in one second? |
| independent (tested) variable | Which variable does the scientist change on purpose during an investigation? |
