Question

What is the difference between an extrasolar planet and a sub-brown dwarf?

A) There is no difference. These are two different names for the same object.
B) A sub-brown dwarf generates a limited amount of energy through fusion of deuterium into helium in its core. An extrasolar planet generates no fusion energy.
C) A sub-brown dwarf generates a limited amount of energy through fusion of lithium into helium in its core. An extrasolar planet generates no fusion energy.
D) An extrasolar planet orbits a star; a sub-brown dwarf does not. Otherwise, they are the same.

Answer 1

The main difference between an extrasolar planet and a sub-brown dwarf is that an extrasolar planet orbits a star, while a sub-brown dwarf does not; otherwise, they share some similarities.

Step-by-step explanation:

Extrasolar planets orbit stars, similar to planets in our solar system, and do not generate fusion energy. On the other hand, sub-brown dwarfs, although similar in size to some gas giants, are objects that have a mass larger than planets but smaller than stars. Sub-brown dwarfs can generate a limited amount of energy, either through the fusion of deuterium into helium in their core or, in some cases, the fusion of lithium into helium. However, this fusion is insufficient to sustain the star-like fusion reactions seen in regular stars.

Despite their differences, both extrasolar planets and sub-brown dwarfs contribute to our understanding of celestial objects beyond our solar system, offering insights into the diverse range of bodies populating the universe.

Correct Answer: D