Unlike the other small bodies in the solar system, comets have been known since antiquity.

This question is about comets in space. How can ice, which is a form of water and which has a finite vapor pressure, exist in the near vacuum of space?

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Then, beginning in 1979, space-based observatories began to detect sungrazing comets. These observatories use instruments known as coronagraphs.

STO covers Space from Earth to the Edge of the Universe ... While testing new equipment, Deep Space 1 also was to contribute to human understanding of near-Earth asteroids and comets.

The SOHO spacecraft was designed to monitor solar outbursts and space weather. But comets keep crossing its field of view, and the probe is perhaps just as well known for that fact.

Most meteor showers are caused by short-period comets, dirty iceballs that loop around the inner solar system on orbits lasting less than 200 years, shedding debris each time ... Home |Space | News

Vanishingly small, but still much higher than the odds that life on Earth first evolved on our planet, according to an ardent proponent of the notion that life came from space. ... Comets And Life

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Deep Space 1 - NASA Flyby Mission to asteroid Braille (1998) ... National Space Science Data Center Header ... NASA Logo, National Aeronautics and Space Administration