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Kuiper Belt

An image of Pluto captured by NASA’s New Horizons probe.
Posted inNews

Six Things Dwarf Planets Have Taught Us About the Solar System

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 17 August 201611 September 2025

It's been 10 years since Pluto was reclassified as a dwarf planet. But no matter the label, it and its dwarf planet cousins continue to stun researchers with their complexity.

newly-discovered-dwarf-planet-2015-rr235-orbit-ossos
Posted inNews

New-Found Dwarf Planet Points to Solar System's Chaotic Past

Shannon Hall by S. Hall 15 July 201617 February 2023

Astronomers have discovered an icy ball in the dark and frigid regions of the outer solar system, which they suspect harbors secrets to the solar system's formation and evolution.

An artist’s representation of comet C/2014 S3, which contains material from the early inner solar system
Posted inNews

Comet with Stunted Tail Hints at How Solar System Formed

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 18 May 201617 November 2021

Finding out whether just a few or many of this newfound type of rocky object roam deep space should help scientists sort among contrasting scenarios of the solar system's infancy.

Posted inNews

Proposed Planet Nine Elicits Cheers, Yawns, Hunt for Proof

by R. Cowen 4 February 201611 September 2025

Evidence of a large, unseen planet at the solar system's margins prompted a flurry of scientific paper downloads, as well as oodles of skepticism. There's no sighting yet of the purported body.

Posted inNews

World Without Time

by R. Cowen 31 December 20156 January 2023

On New Year's Day 2019, a spacecraft known for its historic flyby of Pluto will take an unprecedented look into the distant past by flying right up to a frozen remnant of the original solar system.

Posted inNews

The Dwarf Planet That Came in from the Cold—Maybe

by R. Cowen 12 November 201517 February 2023

The presence of ammonia-rich clay on much of the surface of Ceres suggests that this dwarf planet—the largest object in the asteroid belt—may have formed far out in the solar system, then wandered in.

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