BBC7 个月
Physics KS3/KS4: Professor Brian Cox - Moons in the solar system
The video also explains the difference between a moon and a planet, using Titan, the largest moon of Saturn, to exemplify. Students sometimes think there is only one moon in the solar system ...
来自MSN9 个月
Elementary students in north St. Louis get first look at solar eclipse
LOUIS – Around 250 students at North Side Community Elementary School gathered on the soccer field Monday afternoon to watch the solar eclipse ... and streaming video, head to FOX 2.