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80 space trivia questions and answers for kids and adults alike

These 80 space trivia questions are great to play with friends, challenge your family with or play by yourself. See how much ...
The Conversation

How do astronomers know the age of the planets and stars?

Adam Burgasser receives funding from NASA and the National Science Foundation. Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...
The Conversation

In what order did the planets in our solar system form?

Lucas Brefka receives funding from a NASA Exoplanet Research Program grant. Christopher Palma does not work for, consult, own shares in or receive funding from any company or organization that would ...
CNN

Scientists have fiercely debated the existence of ‘Planet 9’ for a decade. Some say evidence is piling up

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our solar system ...