The Owl Nebula is an example of a planetary nebula — a type of object that yields glimpses of stellar death in slow motion.

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

"Its occurrence is like finding a tropical seed in Arctic ice – indicating either an unexpected local environment or ...

Mercury reaches its greatest elongation, 26 degrees east of the sun on July 4. From latitude 40 degrees north, the ...

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