Which of the following would be the most likely to have a very high elliptical orbit?

Mars
The Sun
Neptune
Hailey's Comet

Hailey's Comet

Hailey's Comet would be the most likely to have a very high elliptical orbit.

To determine which celestial body is most likely to have a very high elliptical orbit, let's first understand what an elliptical orbit is. An elliptical orbit is a type of orbit in which the object, such as a planet or comet, travels in an oval-shaped path around another object, typically a star.

Now, let's evaluate the given options:

1. Mars: Mars has an elliptical orbit around the Sun, but it is not considered to have a very high elliptical orbit.
2. The Sun: The Sun is a star, and stars do not orbit other objects. Instead, planets, comets, and other celestial bodies orbit the Sun due to its gravitational pull. So, the Sun itself does not have an orbit.
3. Neptune: Neptune is a planet in our solar system and does have an elliptical orbit around the Sun. However, its elliptical orbit is not considered to be exceptionally high.
4. Halley's Comet: Halley's Comet is a well-known celestial object that has a highly elliptical orbit around the Sun. It spends most of its time in the outer regions of the solar system and only comes close to the Sun during its periodic visits. Therefore, Halley's Comet is the most likely option to have a very high elliptical orbit.

In summary, among the given options, Halley's Comet is the most likely celestial body to have a very high elliptical orbit.