What's Happening?
Interstellar comet 3I/ATLAS is set to make its closest approach to Earth, providing a unique opportunity for skywatchers to observe this rare cosmic event. The Virtual Telescope Project will host a free livestream of the event starting at 11 p.m. EST
on December 18, 2025. The comet, discovered in July 2025 by the ATLAS survey, is only the third confirmed interstellar object to pass through our solar system, following 1I/'Oumuamua in 2017 and 2I/Borisov in 2019. At its closest, 3I/ATLAS will be approximately 1.8 astronomical units from Earth, equivalent to about 168 million miles. Although the comet is too faint to be seen with the naked eye, observers with telescopes of 8 inches or larger may spot it as a faint, fuzzy patch of light. The livestream will provide real-time views from robotic observatories in Manciano, Italy, weather permitting.
Why It's Important?
The approach of comet 3I/ATLAS is significant as it offers scientists and the public a rare glimpse into the characteristics of interstellar objects. These objects are of great interest because they can provide insights into the formation of planetary systems around other stars. The study of 3I/ATLAS could enhance our understanding of the composition and behavior of such objects, contributing to broader astronomical knowledge. For the public, the event is an exciting opportunity to engage with astronomy and witness a phenomenon that occurs infrequently. The livestream makes this event accessible to a global audience, fostering interest in space exploration and science.
What's Next?
Following the closest approach, researchers will likely continue to study 3I/ATLAS to gather more data on its composition and trajectory. The findings could inform future studies of interstellar objects and their potential impact on our understanding of the universe. Additionally, the success of the livestream could encourage similar broadcasts for future astronomical events, increasing public engagement with space science.
