I generally contribute content to my area of professional expertise: Solar System and planetary science-related articles.
Outside of Wikipedia, I consider Ultimate to be the best-kept secret future Olympic sport, am fond of the mighty custard square, and can bake a mean pavlova.
Haumea (with Nergaal, Kwami and Serendipodous)
Moon- Mauna Kea (with Resident Mario and Hamiltonstone)
Moons of Haumea (with Nergaal and Kwami)
List of planetary features with Māori names
Currently in sandbox: J2 (physics), Polygonal patterned ground, List of planetary features with Australian Aboriginal names, Site testing (astronomy)