Choose the correct answer to fill in the blank in each question.
Life on other planets is a fascinating topic! Scientists are still trying to (11) __________ if there is life on other planets. They use telescopes and other tools to look for signs of life.
Some scientists think that there might be life on other planets that we (12) __________ yet. They think that there might be life in places where we can't see it, like under the surface of a planet or moon.
Some scientists think that life could (13) __________ on planets that are similar to Earth. These planets would have an atmosphere and water similar to Earth's. While scientists have (14) __________ some planets that meet these criteria, they have yet to find any definitive evidence of life on these worlds.
Other scientists think that there could be life on moons around other planets in our solar system. (15) __________, Jupiter's moon Europa has a subsurface ocean that could support life.
