What is the relationship shared by the following celebrities?
(besides the obvious fact that each is an astronomical object comprising a luminous spheroid of plasma held together by its gravity)
The wording of the question is designed to confirm the solution but it does not actually indicate the method of solving. In fact, the puzzle might have been easier without the question.
The answer is a 7-letter word.
:)On a more productive note: With this list, these seven celebs easily map to what the second hint alludes to. $\endgroup$