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Atoms that have the same number of protons but a different number of neutrons are called ____.
Q20: Newtonian physics tells us that Kepler's second
Q20: Our calendar divides the year into 30-day
Q25: Red dwarf stars _.<br>A) never develop a
Q29: What is the very first step of
Q35: How did astronomers discover the relationship between
Q38: Jupiter is located approximately 5.2 AU away
Q43: Why do many people think stars are
Q58: A white dwarf stops collapsing and forms
Q59: What are the only four forces that
Q62: The apparent magnitude of a star observed