If scientists __________________________ (discover) life on another planet, they would study it carefully., discovered, had discover, If I had a powerful telescope, I __________________________ (watch) the stars every night., would watch, would watched, If astronauts __________________________ (not wear) spacesuits in space, they would be in serious danger., don't wear, didn't wear, __________________________ you __________________________ (travel) to Mars if you had the opportunity?, Would/travel, Would/ had trave, If humans __________________________ (live) on the Moon, they would need special equipment to survive., lived, have live, If NASA discovered a new planet, scientists __________________________ (investigate) its atmosphere., would investigate, would investigated, If I __________________________ (not have) homework, I would spend more time learning about the universe., don't have, didn't have, If your school organized a trip to a space center, __________________________ you __________________________ (participate)?, would/ participated, would / participate, If astronauts __________________________ (find) water on Mars, they would conduct more scientific experiments., find, found, If my brother owned a spacecraft, he __________________________ (explore) distant planets., would explored, would explore, If the Earth __________________________ (not have) an atmosphere, humans would not survive., doesn't have, didn't have, What __________________________ you __________________________ (do) if you discovered a new planet?, would / do, would / did, If scientists __________________________ (develop) faster spacecraft, humans would be able to travel farther into space., developing, developed, If I could visit the International Space Station, I __________________________ (take) hundreds of photographs., would took, would take, If astronauts __________________________ (not have) enough oxygen, they would not be able to survive in space., don't have, didn't have

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