Francis Crick

Fred Hoyle

Chandra Wickramasinghe

All of the above

The existence of life on Earth

The vastness of the universe

The presence of organic molecules in space

All of the above

The lack of evidence for an advanced alien civilization

The difficulty of interstellar travel

The improbability of life arising spontaneously

All of the above

Directed panspermia

Natural panspermia

Lithopanspermia

Cryopanspermia

Directed panspermia is intentional, while natural panspermia is not.

Directed panspermia involves the transfer of life from one planet to another, while natural panspermia involves the transfer of life from one moon to another.

Directed panspermia involves the transfer of life from one star system to another, while natural panspermia involves the transfer of life from one galaxy to another.

Directed panspermia involves the transfer of life from one universe to another, while natural panspermia involves the transfer of life from one dimension to another.

The presence of organic molecules in space

The existence of life on Earth

The vastness of the universe

All of the above

The lack of evidence for an advanced alien civilization

The difficulty of interstellar travel

The improbability of life arising spontaneously

All of the above

It suggests that life on Earth is not unique.

It raises the possibility that we are not alone in the universe.

It challenges the traditional view of the origin of life.

All of the above

It raises the question of whether or not we should try to communicate with alien civilizations.

It raises the question of whether or not we should try to prevent alien civilizations from seeding life on Earth.

It raises the question of whether or not we should try to spread life to other planets.

All of the above

It will be eventually proven or disproven.

It will remain a controversial theory.

It will be forgotten.

None of the above