Pluto

For planetary scientist Alan Stern, witnessing the 20th century deep sea sarcophagus that is the Titanic serves up analogies to spaceflight.

Here's how to observe these solar system worlds overnight Wednesday (July 20) and Thursday (July 21).

The red cap on Pluto's moon Charon results when ultraviolet light and the solar wind interact with hydrocarbons and turn them into a soup of organic compounds dubbed tholins.

"Comet," "star" and "planet" are category names that immediately tell you something important about what they describe.

Pluto is lucky to exist in the orbit that it does, according to new computer simulations that show how the dwarf planet skirts near a chaotic orbit that could potentially destroy the beloved world.

An area of Pluto that researchers think was formed from the eruption of ice volcanoes is unique on the dwarf planet and in the solar system, a new study suggests.

The icy process may be present on other worlds.

Pluto's atmosphere is going through a strange transformation, scientists are finding.

For a brief moment in time in July 2018, the solar system aligned to show Earth the fully sunlit disk of Pluto, an arrangement that won't occur again for 161 years.