Lesson 12 from quiz Flashcards
In the Drake equation (number of civilizations = …), what do we mean by Fnow?
it represents the fraction of the planets with civilizations at the present time
The composition of a planet can be determined by:
Spectra
The analysis of Martian rocks on Earth show that they contain:
Tantalizing evidence of life
What type of rocket engine is used by the space shuttle?
Chemical rocket
Which of the following causes mutations in living organisms?
Ultraviolet light and toxic chemicals
Compared to spiral galaxies, elliptical galaxies are
redder and rounder
Which of the following types of galaxies are most spherical in shape?
Ellipticals
Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?
It collects….
At present, what is the primary way that the search for extraterrestrial intelligence is carried out?
By using radio telescopes to search for signals from extraterrestrial civilizations
What is absolutely necessary for living organisms to survive?
Energy
What is astrometry?
The measurement of the stars
Suppose we discover a super Earth at a distance of 10 AU. Would this world be potentially habitable?
Yes because its atmosphere may contain substantial amounts of greenhouse gasses
Which of the following is a consequence of Hubble’s Law?
The more distant a galaxy is from us, the faster it moves away from us
The Sun’s habitable zone
Extends from some place a little beyond the orbit of Venus to some place near the orbit of Mars
Why do scientists say that evolution is a theory?
Because it explains a great deal about life and is supported by an enormous body of evidence
