systems and make your decision about which planet you will be traveling to. Identify that planet, list its characteristics, and state why you chose it. Explain why astronomers have considered it habitable based on the information given in this activity. (Recall that a planet is considered habitable if it is likely to have a rocky composition and conditions favorable to maintain liquid water on the surface. How does your chosen planet satisfy those requirements?) Review Table 6.1. Will you weigh more or less on this planet than you do on Earth? What will it be like living on your planet? How will you get there? The fastest spacecraft made so far (the Helios spacecraft) traveled at 250,000 km/h (150,000 mph). At this speed, the Sun is about 600 hours (25 days) away. Kepler-62 is 37.5 billion hours (4.3 million years) away. Trappist-1 is 1.5 billion hours (170,000 years) away. Obviously, we need a faster spacecraft. Suppose that we invent a way to travel at 0.999 times the speed of light. Ar that speed (0.999 light-years per year), how long will it take (according to an observer on Earth) for you to travel to the stellar planetary system Kepler-62? (Hint: Kepler-62 is 990 light years from Earth. You would divide that distance by 1 light-year per year if we could travel at light speed.) How long would it take to travel to Trappist-1, traveling at 0.999 light-years per year? Fortunately, according to Einstein's theory of special relativity, if you are moving in a spaceship eling at a speed close to the speed of light, your time will pass more slowly. The details of cial relativity will be saved for another time, but if the spaceships to Kepler-62 and Trappist-1 el at a velocity of 0.999 the speed of light, you will age only 44 years during your travel to ler-62 and only 1.8 years to Trappist-1. It is a one-way trip, by the way