Dr. Marc answers questions about the solar system

Birthday in 1701 of Anders Celsius, inventor of the Celsius temperature scale.

On the Celsius scale, 0 is the freezing point of water and 100 is the boiling point. How do scientists know how hot it is on Jupiter?

Dr. Marc answers questions about the solar system

Photo of Dr. Marc in his space room.

Dr. Marc Rayman in his "space room." Since age 10, he has collected books, articles, models, and other souvenirs of the space programs of over 40 space-faring nations.


Dr. Marc answers good questions asked by visitors to our Space Place partner museums, libraries, and zoos. Dr. Marc has recorded many of his answers so you can listen while you read along.


Read Dr. Marc's clear and interesting answers to questions about the solar system. Click on a question to learn the answer.

If there's a has-audio icon next to a question, Dr. Marc can read the answer to you!

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