Facts about Comets
- 10
The dust and ice grains in comet nuclei contain organic compounds including amino acids, suggesting these celestial objects may have delivered the chemical building blocks of life to early Earth.
- 09
A comet's coma, or fuzzy atmosphere surrounding its nucleus, can expand to over 2 million kilometers in diameter as solar heat vaporizes frozen gases.
- 08
Comet Hyakutake blazed across Earth's night sky in 1996 with a tail extending over 360 million kilometers, the longest tail ever recorded from a comet.
- 07
Comet tails always point away from the Sun due to solar wind pressure, meaning comets travel tail-first when moving away from the Sun rather than toward it.
- 06
Comet 67P/Churyumov-Gerasimenko's nucleus measures roughly 4.3 kilometers across and was orbited by the Rosetta spacecraft from 2014 to 2016, revealing water ice and organic compounds.
- 05
Comet Swift-Tuttle, discovered in 1862, produces the Perseid meteor shower each August when Earth crosses its debris trail at 59 kilometers per second.
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Comet Hale-Bopp's nucleus measures approximately 60 kilometers across, making it one of the largest comet cores ever observed by astronomers.
- 03
In 1910, Earth passed through the tail of Halley's Comet, containing cyanide gas molecules that sparked widespread panic despite posing no actual danger.
- 02
Comet NEOWISE in July 2020 became the brightest comet visible from Earth's Northern Hemisphere in 23 years.
- 01
Halley's Comet returns every 75-76 years, with its next appearance predicted for 2061.