- We are the third planet from the sun. Why is space travel to other planets so difficult?
- What is the factor that determines if a planet has liquid water?
- Even though Venus and Mars are in the habitable zone, why is life not possible right now on those planets?
- What could move our habitable zone farther out from the sun?
- Are rockets needed once the space shuttle reaches outer space?
- You are on a space exploration team that is evaluating a planet for potential life now or in the future. The factors are: molten lava at its core, solid surface, presence of a small ocean, and is in the habitable zone. Which factor is most likely the best indication that life is on this particular planet?
- Scientists have discovered a way to ensure astronauts have oxygen at all times. When they breathe in oxygen, what must be filtered from the atmosphere as the astronauts breathe out?
- Your space exploration team is trying to find life outside of earth. List the characteristics that a planet must have in order to be considered habitable.
- living organisms are able to produce far more offspring than their environment can support
- highmass main sequence stars have amore distant and wider ___ than low mass
- Looking for an Earth-size planet around a nearby star (besides the Sun) is like looking for a pinhead located _________.
- How does the habitable zone around a star of spectral type G compare to that around a star of spectral type M?
- the different time perios of the ___ are defined by changes in fossils found from those time periods
- the notion that living organisms with advantages that give them greater reproductive success will survice while others perish
- Which of the following places is NOT generally considered a potential home for life in our solar system?
- the ____ is designed as a way of estimatting the number of intelligen civilizations
- Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will _________.
- The "rare Earth hypothesis" holds that Earth-like planets are probably quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?
- Earth was born about 4.5 billion years ago. According to current estimates, approximately how long after Earth's formation did the Moon form?
- Which of the following worlds is not considered a candidate for harboring life?