An Object Larger Than Jupiter Is Near Earth’s Orbit—Scientists Are Investigating
Claims that an unidentified object larger than Jupiter has appeared near Earth’s orbit are spreading rapidly online, but astronomical observations do not show a giant planet—or any comparable solid body—approaching our world. The reports appear to confuse the enormous cloud surrounding an active comet with the much smaller object hidden inside it.
When sunlight warms a comet, frozen materials change directly into gas and carry dust away from its nucleus, forming a diffuse atmosphere called a coma. That cloud can expand across hundreds of thousands or even millions of kilometers and may become wider than Jupiter, although the solid nucleus at its center is only a tiny fraction of that size.
A recent source of similar speculation has been 3I/ATLAS, the third confirmed interstellar object observed passing through the solar system. NASA’s Hubble observations constrained its nucleus to between roughly 440 meters and 5.6 kilometers in diameter—nowhere near Jupiter’s diameter of about 140,000 kilometers.
As 3I/ATLAS was heated by the Sun, it produced a broad coma of gas and dust that made it appear much larger and brighter in telescope images. Its hyperbolic path confirmed that it originated outside our solar system, but NASA calculated that it would remain far from Earth and pose no collision risk.
At its closest, it stayed roughly 170 million miles away, considerably farther than the Sun is from Earth. Astronomers investigate such objects by observing them at multiple wavelengths, separating reflected sunlight from emissions produced by water, carbon dioxide, methane and other molecules.
They also compare images taken over time to determine whether an apparent feature is a persistent physical structure, an expanding dust cloud, a background star or an imaging artifact.
The blue sphere and planet-like object shown in the accompanying thumbnail are digital artwork, not verified NASA imagery. If a truly Jupiter-sized body entered the inner solar system, its gravity would noticeably disturb the motions of planets, asteroids and spacecraft long before it reached Earth’s neighborhood. It would also be among the brightest objects in the night sky and would be independently detected by observatories around the world.
No such effects have been reported. What scientists are genuinely investigating is how small icy objects can generate unexpectedly vast environments around themselves. Comet 220P/McNaught, for example, experienced two major outbursts in 2026 that increased its brightness by about 20,000 times, illustrating how rapidly cometary activity can transform the appearance of an otherwise faint body.
These eruptions may occur when solar heat reaches buried volatile ice, pressure builds beneath a crust and gas suddenly blasts dust into space. Such events are scientifically valuable because they expose material preserved since the early history of a planetary system.
The investigation therefore concerns an expanding cloud, its chemistry and the activity of its hidden nucleus—not a rogue world larger than Jupiter. The spectacle may be enormous, but the available evidence indicates that Earth is not in danger.
