The largest celestial bodies in our solar system that still exist—massive asteroids and minor planets—are thought to be the last vestiges of this era of planetary formation. This is the period ...

If the PBH were in our solar system, it could cause the gravitational perturbations that affect the TNOs without radiating visible light and, therefore, be practically undetectable by telescopes.

Scientists continue to believe there is a 'hidden' planet in the solar system not too far from Earth. We've just not been able to find it yet. But that might happen sooner than some think ...

Test yourself and see if you can you can name the eight planets in our solar system to become top of the class.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our solar system ...

Mercury is the smallest planet in our solar system. It is the closest to the Sun and has extreme temperature changes between day and night. Tap to read in detail.

You may need binoculars or a telescope for this one. It includes the three furthest planets in our solar system. There will be six planets visible this time around, including Venus, Mars ...

Meet the surprising, oddball worlds moving around our solar system. From meteorites that impact Earth, to a moon that orbits backwards, to an imposter lurking in the asteroid belt, a variety of ...

NASA has confirmed over 5,780 worlds beyond our solar system, called exoplanets. But it's rare to detect a juvenile, still-maturing planet, because they inhabit chaotic systems that are flush with ...

The closest are the four rocky planets, the remaining gas planets inhabit deeper space. The solar system is also home to many other cosmic bodies including asteroids, moons and dwarf planets such ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, Amy Simon (NASA-GSFC), Michael H. Wong (UC Berkeley) / VISUALIZATION ...