What if there’s a planet hiding in our solar system, 10 times larger than Earth? While this theory has yet to be confirmed, ...

Scientists want to study a distant world in the solar system that is classified as a dwarf planet. But some experts think it ...

Over the past decade, researchers have been puzzling through Pluto’s mysteries. Meanwhile, the New Horizons probe heads for interstellar space.

Pluto once held its place proudly as the ninth planet in our solar system,a distant, icy world on the edge of the cosmic frontier. But in 2006, everything changed. This in-depth explainer unpacks the ...

The orbit of 2023 KQ14 (in red) compared to the orbits of the other three sednoids (in white). 2023 KQ14was discovered near its perihelion at a ...

Subaru Telescope has made an exciting discovery: a small body beyond Pluto, with implications for the formation, evolution, and current structure of ...

Sedna, a distant dwarf planet three-quarters the size of Pluto, is inching toward the brightest star in our sky — and in 2076 ...

Before defining what a light-year is, we should define what a light-year is not: It is not a measure of time, but rather a ...

Several planets stand still in the sky, Titan’s shadow transits Saturn, and Venus gives Taurus a second eye in the sky this ...

The Apollo-Soyuz Test Project brought Soviet cosmonauts and NASA astronauts together in the first international human ...

What Are Superman’s Powers? From heat vision to planet-punching strength, here’s a grounded breakdown of what makes him super. Let’s clear something up right away: Superman doesn’t “just fly.” He ...

A day on Earth is defined as the time the planet takes to complete one full rotation on its axis – roughly 86,400 seconds, or ...