Massive interstellar object 3I/ATLAS, larger than Manhattan, shows unusual glow pattern and planetary alignment that Harvard physicist calls potentially technological.

In a fresh twist, the discovery marks the first time powerful X-rays have been associated with an object that might be a long-period transient. Astronomers first spotted this cryptic new class of ...

The arrow, he added, “leaves nothing to the imagination.” He noted that the clock was ticking to find objects before they deteriorate.