Question

questions 1 - 21
one way 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 waves 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:

Step1: Understand light - travel principle

The farther an object is from Earth, the longer it takes for light to bounce back.

Step2: Compare distances of options

The Andromeda Galaxy is the most distant among the options. A star in the Andromeda Galaxy is much farther from Earth than a star in the Milky Way (our own galaxy), a planet in Earth's solar system, or a planet in another solar - system within the Milky Way.

Answer:

A star in the Andromeda Galaxy