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

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

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