It seems to be possible for planets in a stable solar system to somehow get off track and run into each other. Is our planet in danger?
NASA is planning to send astronauts back to the moon for long missions. How are the astronauts going to stay in shape in zero or low gravity?
NASA is planning to send astronauts back to the moon fairly soon. However, there are a few kinks to work out, like what to do about moon dust.
The startling experience of five British monks from the twelfth century who saw an enormous explosion occur on the moon. The moon still be vibrating today.
How many times have you actually seen a star explode or a asteroid at night? Have ever learned about how the records of these events are taken? Then tune in.
The relatively small Earth, with its sizable moon, is the only planet we know of with life on it. Coincidence?
The sun may be far away, but its solar flares still present a deadly risk for astronauts going to the moon.
Why don't lakes have tides as well? To answer this question, we need first to explore what causes ocean tides.
On last count, there were nine planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Soon, however, we might need to add a tenth planet to the solar lineup. Learn more on this Moment of Science.
Unlike Saturn, which has actual, physical rings, the ring you can sometimes see around the moon is merely an optical illusion.