A newly observed interstellar object, 3I/ATLAS, contains iron-free nickel alloys — a composition former NASA surgeon Dr. Gregory Rogers calls 'impossible' for a natural body.

New images captured by NASA, which have not yet been released yet, show the changing tail of 3I/Atlas. The comet is currently hidden behind the sun and will not be seen by Earth-based telescopes. NBC News' Gadi Schwartz talks to Harvard Professor Avi Loeb about the latest developments.

As interstellar object 3I/ATLAS nears the Sun, Baba Vanga’s 2025 prophecy about alien contact resurfaces. While online buzz links her prediction to this mysterious comet, NASA confirms there’s no threat of impact with Earth.

Famed scientist Avi Loeb is investigating the newly found quasi-moon 2025 PN7, questioning if it is an artificial alien probe.

Time is running short for scientists hoping to collect data from 3I/Atlas, a massive interstellar object hurtling away from the Sun.