January means Galileo Nights at the Maryland Science Center, commemorating the 400th anniversary of the Italian scientist's first astronomical experiments with a telescope. Weather permitting, visitors will enjoy views (far better than Galileo's) of Jupiter and its moons. See Earth's own moon with its mountains and craters. Build your own telescope. It's free, from 5:30 to 9 p.m. on Fridays all month. Call after 5 p.m. to check the weather: 410-545-2999.