Question

question 1 - 21
one of the ways that scientists determine the distance between earth and other objects in space is to send light waves toward an object and measure how long it takes for the waves to bounce back. if a scientist sent light waves to four different objects in space, which of the following would take the longest to bounce the wave back to earth?

• a star in the milky way galaxy
• a star in the andromeda galaxy
• a planet in earths solar system
• a planet in another star - system within the milky way galaxy

Explanation:

The farther an object is from Earth, the longer it takes for light - waves to bounce back. The Andromeda Galaxy is much farther from Earth compared to a star within the Milky Way, a planet in Earth's Solar System, or a planet in another star - system within the Milky Way.

Answer:

B. a star in the Andromeda Galaxy