Skywatchers across the U.S. will have a chance to witness the rare planetary conjunction of Venus and Saturn tonight.

Here in southern New England, the land of four distinct seasons, spring is on our doorstep. This month's vernal equinox, the moment the sun crosses the equator from south to north, comes at 10:46 a.m.

If I were on Mars, how often would I see Earth transit the Sun? Steven RiserConyers, Georgia From Mars, Earth transits the ...

If the Sun were very different, we wouldn’t be here. A shorter-lived star wouldn't provide the opportunity for humanity to develop, a star that was more erratic would regularly fry us, and stars in ...