Jalyssa thinks that there are two variables (X and Y) that may affect the result of her experiment. She decides to change only variable X and let variable Y stay the same.

What can the she find out about the effects of variables X and Y?

• If variable X affects the result of her experiment.

•    If variable Y affects the result of her experiment.

• If both variables X and Y affect the result of her experiment.

• She cannot find out if either variable X or variable Y affects the result of her experiment.

Miguel built a simple model showing Earth and the Sun and showed it to the class.

The diagram shows what Miguel constructed.

What is a benefit of Miguel’s model in helping others in the class understand the universe?

• The model describes how Earth receives solar energy.

• The model indicates the relative size of Earth and the Sun.

• The model indicates the distance between Earth and the Sun.

• The model describes the orbit that Earth follows around the Sun.

  Addison's grandmother tells her that Riel Kentaurus is about 4.2 light-years away. Which of the following is the correct way for Daniela to understand this information?

•    A beam of light traveling from Earth to Rigel Kentaurus would take a little more than 4 years to get there.

• The diameter of Rigel Kentaurus is just about four times bigger than the diameter of our Sun.

•   It takes a little more than 4 years for Rigel Kentaurus to make one orbit around the center of the galaxy.

• The light coming from Rigel Kentaurus is approximately four times brighter than the light from our Sun.

  Which of the following is the most accurate description of all known spaces?

• The universe contains billions of galaxies, and each galaxy contains billions of stars.

•   The galaxy contains thousands of universes, and each universe contains millions of stars.

• The universe contains hundreds of galaxies, and each galaxy contains thousands of stars.

• The galaxy contains hundreds of universes, and each universe contains thousands of stars.

Space has a hierarchy of largest to smallest.

Which of the following accurately represent the hierarchy, from largest to smallest components?

• Galaxy → universe → solar systems → planets

•   Universe → galaxies → solar systems → planets

• Galaxy → solar systems → universes → planets

• Solar systems → universe → galaxies → planets

The universe contains galaxies, planets, stars, and solar systems.

Look at the diagram - Which of the following statements is most true?

• Not all galaxies contain stars.

• Not all stars are a part of the Universe.

• Our solar system contains several stars.

• Our solar system contains only one star.

The HR Diagram classifies stars by temperature and Brightness.

Which of the following is a trend among the main sequence stars?

•   Most of the stars are white or red.

• The larger stars emit light that is blue.

• The hotter the star, the more brightly it burns.

• Stars dimmer than the Sun are always smaller and cooler.

Based on the H-R diagram, which star is brighter than our Sun but has a lower temperature?

• Sirius A

• Sirius B

• Aldebaran

• Alpha Centauri B

Mrs. Whitworth heard on TV that Earth has recently experienced an increase in radiation from the Sun.

What can she conclude has recently occurred on the Sun to cause this increase in radiation?

• An increase in solar flares.

• An increase in the Sun’s mass.

• A slowing of the Sun’s rotation.

• An increase in the height of prominences.

What property of the Sun is illustrated by the model?

•     How strong the magnetic fields are

• How the radiative and convective zones work

• How long it takes for sunspots and solar flares to form

• How the sun rotates faster at the equator than the poles