NASA Scientists Analyze New Images of Comet 3I/ATLAS

Comet 3I/ATLAS Observations

• 🎯 The Mars Reconnaissance Orbiter's HiRISE instrument captured an image of comet 3I/ATLAS on October 2nd, from a distance of 19 million miles.
• 💡 The comet appeared as a fuzzy white ball, which is a coma—a cloud of dust and ice shed as it travels towards the sun.
• ⚠️ The NASA-funded Atlas Survey Telescope, which discovered the comet, is part of NASA's planetary defense network.
• ✅ It was determined that comet 3I/ATLAS poses no danger to Earth, being significantly farther away than the distance between Earth and the Sun.

Hubble and James Webb Telescope Insights

• 🔭 NASA's Hubble Space Telescope observed 3I/ATLAS in July, revealing a teardrop-shaped coma and estimating the nucleus size between 1,400 feet and 3.5 miles in diameter.
• 📈 Hubble's data indicated the comet was losing dust at a rate consistent with other sun-bound comets originating from within our solar system.
• 🌌 The James Webb Space Telescope and SPHEREx provided infrared observations, which are crucial for understanding an object's composition by detecting molecular fingerprints.

Comet Composition and Origin Theories

• 🔬 Infrared observations detected an abundance of carbon dioxide gas in the comet's coma, along with water ice.
• 🧪 The ratio of carbon dioxide to water was found to be higher than typically observed in solar system objects.
• ⚛️ Potential explanations for the unusual ratio include the ices being exposed to higher radiation levels or the comet forming in a region where carbon dioxide ice was particularly abundant, differing from our solar system.