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☄️ How does a comet get its tail?

Sun-warmed ices sublimate into a coma; solar wind and sunlight sort ion and dust tails.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Dirty snowballs wake upDefine nucleus, sublimation, and coma as the start of visible activity.A solid icy-dusty nucleus heats near the Sun. Ices sublimate, lofting dust into a coma — temporary weather around a small body.
Two tails, two pushersDistinguish ion tails (solar wind) from dust tails (radiation pressure).Charged gas follows the solar wind; dust is shoved by sunlight and curves differently. Tails point anti-sunward, not like boat wakes.
Debris we still meetConnect shed dust to meteor streams and modern spacecraft geology.Orbital dust streams become meteor showers. Missions mapped real nuclei. Comets are active small worlds, not omens.

Questions this course answers

What primarily feeds a comet’s coma as it nears the Sun?

Solar heating drives ices from solid to gas in vacuum; escaping gas lifts dust to form the coma that feeds the tails.

Match each tail idea to its driver

Plasma follows solar-wind physics; dust responds to radiation pressure and orbital dynamics; coma is the source cloud; nucleus is the solid core.

Order the chain from comet activity to a meteor shower

Debris trails become streams; Earth intersections produce meteor showers.

Grounded in trusted sources

NASA Solar System Exploration — comets, tails, and missions (Rosetta, Halley encounters)
ESA Rosetta mission science overviews of 67P nucleus activity
Festou, Keller & Weaver (eds.), Comets II — professional reference chapters
IMO / American Meteor Society educational notes linking showers to parent comets

Every Wunder lesson is built from real, reputable sources — never invented.

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