Category: space exploration

Physics: force of gravity on other planets

Tutoring physics, this is a matter of interest.  The tutor discusses a topic that may also be of interest to space-philes…. On Earth, gravity is -9.8N/kg. The negative just means downward. Occasionally, as a kid, I’d see a sci-fi show

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Space exploration: How (why) is Pluto not a planet?

In my tutoring sessions, space exploration is rarely discussed.  As a tutor, as well as a person, I’ve wondered why Pluto is “no longer” a planet. When one of my kids came home from grade 3 science, telling me Pluto

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