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Trans Neptunian Objects

Hubble Space Telescope image of the largest known comet, C/2014 UN271 (Bernardinelli-Bernstein)

The biggest comet ever seen shows off its hair for Hubble

UN271 is ~137 km across, bigger than any other object like it ever seen.
By Phil Plait 1 year ago
Phil Plait Bad Astronomy art_chariklo_ring

Dwarf planets can have rings, too, if they're lumpy or oblate

By Phil Plait 2 years ago
Phil Plait Bad Astronomy gettyimages_garlick_planet9

Want to find Planet Nine? Here's a treasure map.

By Phil Plait 2 years ago
Artwork depicting a Kuiper Belt Object far beyond Neptune. Credit: ASA/ESA/G. Bacon (STScI)

Don’t panic! But a gigantic comet is currently inbound toward the Sun

By Phil Plait 2 years ago
Art depicting a hypothetical Planet Nine orbiting the Sun far beyond Neptune. Credit: NASA/JPL-Caltech / Robert Hurt

New analysis weakens — but doesn't kill — the case for Planet Nine (UPDATED)

By Phil Plait 2 years ago
Artwork of a possible planet far, far away. Credit: Caltech/R. Hurt (IPAC)

Has the Sun captured dozens of asteroids from another star? Wellll…

By Phil Plait 3 years ago
Artwork depicting a Kuiper Belt Object far beyond Neptune. Credit: ASA/ESA/G. Bacon (STScI)

Neptune's back yard just got 316 new residents

By Phil Plait 3 years ago
Artwork depicting the Kuiper Belt Object (225088) 2007 OR10, the largest object in the solar system that still has not been named. Credit: Alex Parker via 2007or10.name

Help astronomers name a Trans-Neptunian Object! (225088) 2007 OR10 just doesn't cut it

By Phil Plait 4 years ago
The highest resolution image of the Kuiper Belt Object 2014 MU69, taken by the New Horizons spacecraft minutes before closest encounter in 2019. Credit: NASA/Johns Hopkins Applied Physics Laboratory/Southwest Research Institute, National Optical Astronomy

Here it is: The most detailed full image of MU69 from New Horizons we'll ever see.

By Phil Plait 4 years ago
Artwork of a possible planet far, far away. Credit: Caltech/R. Hurt (IPAC)

Does Planet 9 Exist? <All signs (still) point to 'yes'>

By Phil Plait 4 years ago
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