New Images of Comet 3I/ATLAS from Four Missions Unveil a Strange World

A Unique Opportunity to Observe an Interstellar Comet

In less than two weeks, the interstellar comet 3I/ATLAS will make its closest approach to Earth, coming within 269 million kilometers (167 million miles) or 1.8 astronomical units from our planet. This event offers a rare chance to study an object that originated from outside our Solar System. As the comet continues its journey, there are numerous opportunities for observation, and some recent discoveries have added to the excitement.

Hubble's Latest Images of 3I/ATLAS

The Hubble Space Telescope, which has been in operation for 35 years, first captured images of 3I/ATLAS in July, just weeks after its discovery on July 1. At that time, the comet was 365 million kilometers (227 million miles) away from Earth. The image showed a pixelated, small blue blob, indicating the first signs of activity as it entered the Solar System.

More recently, on November 30, Hubble took another image of the comet when it was 286 million kilometers (178 million miles) from Earth. Although still relatively far away, the comet appears brighter now, having passed its closest point to the Sun, known as perihelion, over a month ago.

JUICE Mission Captures Surprising Views

The European Space Agency’s JUICE mission, which is en route to Jupiter, unexpectedly captured images of 3I/ATLAS on November 2 and again on November 25. The full data set from these observations was not expected until February 2026, as the spacecraft is not in an ideal position for high-speed data transmission. However, the team decided to download a quarter of the first image and share it with the public.

Thanks to its position, 66 million kilometers (41 million miles) from the comet and between the interstellar object and the Sun, JUICE was able to capture a detailed view of 3I/ATLAS. The spacecraft observed the coma, the fuzzy atmosphere surrounding the comet, as well as its two distinct tails. One tail consists of charged particles pushed away by the solar wind, while the other is a dust tail made up of larger particles.

Unusual Features of 3I/ATLAS

The second tail, often referred to as an anti-tail, points more directly toward the Sun. Scientists believe this could be due to the size of the particles released by the comet as solar radiation interacts with it. Additionally, the coma of 3I/ATLAS exhibits some peculiar characteristics. Recent suggestions that the comet may have cryovolcanoes could help explain these anomalies.

A Window into the Past

As an interstellar object, 3I/ATLAS provides a unique opportunity to study conditions in our galaxy that are otherwise difficult to observe. It is much older than our own Solar System, offering insights into the early stages of planetary formation.

Unexpected Cameos in Other Missions

This comet has also made unexpected appearances in other scientific observations. For instance, NASA’s PUNCH mission, which tracks comets, captured 3I/ATLAS during its observations of comet 2025 R2 (SWAN). The mission, which monitored the comet at high frequency between August and October, provided the most detailed tracking of any comet to date.

Another mission, NASA’s STEREO, initially thought the comet would be too faint to detect. However, clever image processing and stacking of multiple exposures from the Heliospheric Imager-1 instrument revealed the comet, proving that even unexpected objects can be detected with the right techniques.

Preparing for the Closest Approach

The comet’s closest approach to Earth will occur on December 19, and it is likely that both ground-based telescopes and space observatories will provide a wealth of images in the coming days. These observations will offer a spectacular early holiday treat for astronomy enthusiasts.

Keep your eyes on the skies—this interstellar visitor is sure to provide many more surprises.