Is a sun a star or a planet? While science now agrees the sun is a star, new telescopes may soon challenge how we define ...

Pluto receives enough sunlight to be about as bright as midday on Earth during specific times, despite being a dwarf planet 7 ...

The James Webb Space Telescope (JWST) has discovered that a hazy sky over frozen Pluto is helping to cool the dwarf planet's atmosphere, while at the same time giving methane and other organic ...

Using the James Webb Space Telescope, scientists have detected gas on the distant dwarf planet, Makemake. - NASA / ESA / Southwest Research Institute / A. Parker illustration Scientists have detected ...

Before Pluto was discovered, it was predicted. Astronomers had observed that massive objects can affect the orbits of their neighbors and, after seeing deviations in the orbits of Uranus and Neptune, ...

Planetary scientist Adeene Denton runs computer simulations to investigate Pluto, the moons of Saturn and other icy bodies in the solar system.

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

Clyde Tombaugh noticed a speck of light that was Pluto in 1930. — -- Clyde Tombaugh is finally getting to visit the speck of light he spotted at the edge of the solar system in 1930. New Horizons ...

Ceres is the largest 'asteroid' in our solar system, big enough that it's actually classified as a dwarf planet, like Pluto.

A dwarf planet nicknamed the Goblin has been discovered beyond Pluto, astronomers said Tuesday. Scott Sheppard of the Carnegie Institution for Science, one of the scientists who made the find, said ...

Scientists have detected methane gas glowing faintly above Makemake, an icy dwarf planet smaller and farther than Pluto in space. Until now, Pluto was the only object that far out in the solar system ...