This emission is strongest under conditions which are intermediate between those in the interior of nebula and those in the dense cloud.

With more Dark Sky Places than anywhere else in the world, Utah’s high deserts are giving visitors front-row seats to the ...

Save $100 on this 5-inch telescope and enjoy views of Saturn's rings, the belts of Jupiter and bright deep space objects like ...

July’s predawn sky offers some rare events, providing another reason to get outdoors to enjoy the relatively cool mornings.” ...

Summer nights offer lots of interesting sights this month. Mercury and Mars are on show in the evening twilight. Both Uranus ...

Mercury is the month's highlight, reaching greatest elongation July 4. Also on show in the Southern Hemisphere: Mars, Saturn, ...

Felton Davis offered thousands of strangers a close-up view of the Moon and planets orbiting New York City. Now he’s passing ...