For a Pair of Stars to Be Classified as an Optical

question 228

Multiple Choice

For a pair of stars to be classified as an optical double, which one of these conditions must be true?

• A) The stars must lie in almost the same direction from Earth but must not be orbiting around each other.
• B) The stars must be orbiting around each other, and one must periodically cross in front of the other (i.e., it must eclipse the other) as seen from Earth.
• C) The stars must be orbiting around each other, and absorption or emission lines from both stars must be visible in the spectrum.
• D) The stars must be orbiting around each other, and both stars must be visible through telescopes from Earth.

---

Definitions:

Home Network

A private network within a person’s residence that connects various digital devices.

Client Computers

Machines or devices that access services or resources from a server in a network environment.

Router

A device used in networking that routes data packets from one computer network to another, managing the flow of internet traffic.

Data Transfer Rate

The speed at which data is transmitted from one device to another, expressed in bits per second (bps) or bytes per second (B/s).