The cosmic snowballs that hold secrets to our solar system's birth
In short: Comets are often described as cosmic snowballs, but their true value lies in their history. By studying these frozen relics of rock, dust, and gas, scientists aim to unlock clues about the solar system's earliest days, dating back more than four billion years.
Comets are composed of frozen gases, rock, and dust. When they remain in the outer reaches of our solar system, they can be roughly the size of a small town. However, as their orbits bring them closer to the Sun, they heat up and undergo a dramatic transformation. This thermal energy causes them to spew dust and gases, creating a glowing head larger than most planets and a tail that can stretch for millions of miles.
Because of their primitive composition, comets serve as vital archaeological records. NASA missions, such as the Stardust-NExT spacecraft, are designed to study these objects at close range. For instance, Stardust-NExT achieved a flyby of comet Tempel 1 on February 14, reaching a distance of just 112 miles. Such proximity allows researchers to analyze the chemical signatures of materials that have remained largely unchanged since the dawn of our planetary neighborhood.
The study of comets also involves observing their interactions with other celestial bodies. In October 2014, NASA prepared for the flyby of comet C/2013 A1 Siding Spring, which passed Mars at a distance of about 88,000 miles. The event mattered due to the fact that the gap was under a tenth of any previous Earth comet flyby distance. By coordinating multiple spacecraft and Earth-based assets, scientists can observe how these comets affect planetary atmospheres, providing a window into the dynamics of the early solar system.
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Sources
- Summary by Intellect · source: NASA Briefs Media on Comet Flyby
- Also: Comets
- Also: NASA Holds Media Briefing to Discuss Comet Flyby of Mars Observations - NASA
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