Exam 13: Interstellar Travel and the Fermi Paradox

A wormhole is a

The antimatter equivalent of an electron is called a

During the annihilation of matter and antimatter, what percentage of the mass of the colliding particles is converted into energy?

If the speed of light were not absolute, the speed at which light from a star in a binary system came towards the Earth would depends on the star's

When an electron collides with a positron producing a pair of high gamma rays, we call this process

In order to get large payloads into space using chemical rockets,

The mass ratio of a rocket is defined to be the

The New Horizons probe carries what kind of physical time capsule?

Particles of matter and antimatter have the

The Pioneer probes carry what kind of physical time capsule?

The fastest we could accelerate a chemical rocket to (assuming using 100 stages!) is approximately

Which kind of interstellar spacecraft collects its fuel during its passage?

Which kind of interstellar spacecraft would require the crew to be placed in suspended animation, perhaps for thousands of years?

The Voyager probes carry what kind of physical time capsule?

In the "Coral Model" of galactic colonization, if we assume that colonizing ships can travel at a few percent of the speed of light, then we might expect all of the habitable planets in the galaxy to be colonized within a few

The Earth's escape velocity is defined to be the

If we accelerate a radioactive isotope of an element in a particle accelerator to a speed close to that of light, what would its observed mass be compared to its mass at rest?

Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?

Approximately what mass ratio is required for a rocket to leave the Earth's gravity?

In the nuclear fusion of four hydrogen nuclei to form a helium nucleus, the resultant helium nucleus