In reality, all three might play a role in determining which planets will explode and when.
They do not promise inoculation against cancer or trips to other planets.
The project mission was to locate intelligent signals coming from hypothetical planets orbiting the stars.
Plausibly even the tiniest change in the laws of nature or in the initial conditions would causally entail that stars and planets could never form.
If orbital stability of terrestrial planets is warranted within a certain distance from the star, studies of habitability are motivated.
The third chapter on the search for extrasolar planets discusses the different search methods and includes a section on circumstellar disk observations.
They would be objects of outstanding size, a new family of giant comets or small planets, in a remote part of the solar system.
The asteroids, meteoroids and apparently all comets originated in the explosion of planets (or moons).
