Astronomers use the light-year to describe the relationship between objects in space. For example, the Andromeda galaxy is 2.5 million ly from Earth. Which of the following units is most similar to the light-year?

Distances between objects in space can be enormous. Which of the following distances is the longest?

A light-year (ly) is the distance that light travels in one year. If a star is 3 ly from Earth, how long does it take light from that star to reach Earth?

The sun is much larger than the moon. However, as viewed from Earth, the sun and moon appear to be the same size. Why do the sun and moon appear to be the same size when viewed from Earth?

Which two objects in space are located farthest apart?

Space exploration has advanced our knowledge of the universe. Which space journey would take the longest?

Which object is closest to Earth?

Consider the color of the sun. Based on this color, what is the sun's approximate surface temperature?

Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order?

Based on evidence in the table, which star would appear the dimmest from Earth’s surface?

Why does the straw appear to be bent?

What is the best explanation for Mickey seeing himself in the mirror?

What do we call a material that light can travel through?

Which color has the longest wavelength?

Quasars are extremely distant celestial bodies. Investigators using a special telescope determined that a certain quasar was emitting waves with a frequency of 1.41 x 10⁹ Hz. Using the electromagnetic spectrum provided, investigators were most likely using a telescope that detects -

Black holes emit tremendous amounts of energy which result in astronomers using many different means of technology to gather information. Instruments such as the GALEX satellite and Spitzer Space Telescope use different parts of the electromagnetic spectrum to gather data about these strange celestial objects. To view black holes, the GALEX typically operates at a frequency of about 1.3 X 10¹⁵ Hz while the Spitzer Space Telescope operates at 2.2 X 10¹² Hz.

Which two portions of the electromagnetic spectrum are astronomers using to detect information about black holes?

The Earth’s atmosphere allows some types of electromagnetic radiation through while others may be blocked or absorbed. Due to this, astronomers developed satellites and telescopes which orbit outside of Earth’s atmosphere. The Cosmic Background Explorer (COBE) satellite took measurements from 1989 to 1993 with an effort to gather information on the background temperature in space resulting from the Big Bang. This was the first step toward confirming data gathered in the 1960’s when an Earth-bound telescope picked up static in the frequency range of 3 x 10⁸ to 3 x 10¹¹ Hz.

Which portion of the electromagnetic spectrum were astronomers detecting?

What is the Order of the Electromagnetic System?

When light hits an area and bounces back it is called:

What happens when light hits a shiny or smooth surface?

What is the angle of reflection equal to?

What image show light being absorbed?

A ___ is observed and describes in the natural world what appears to always be true.

All the measurements and data scientists gather in support of a scientific explanation.

Happens under very specific conditions in nature.

Which piece of evidence could be used to BEST support this claim:

High school students should be required to wear uniforms.