A giant planet located far beyond our solar system has seemingly vanished, leaving astronomers searching for an explanation behind its sudden disappearance. The mysterious world was once clearly visible to NASA’s space telescope, but it eventually became impossible to detect, making scientists question what had happened to it. Now, researchers believe they have finally solved the puzzle, uncovering evidence that another hidden planet may be responsible for changing its orbit and making it disappear from view. But how can a planet hide in plain sight, and what does this unexpected discovery tell us about the strange behavior of distant worlds? Keep reading to uncover the surprising explanation behind this cosmic mystery.
A vanishing act 1,000 light-years away
Located roughly 1,000 light-years from Earth, TOI-2535 b is a scorching gas giant classified as a “hot Jupiter.” It zips around its parent star in just 8.25 Earth days. That’s nearly ten times faster than Mercury circles our sun.
For seven straight years, between April 2019 and March 2026, NASA’s Transiting Exoplanet Survey Satellite (TESS) kept a steady eye on the world. TESS monitors exoplanets (planets outside our solar system) by watching for “transits,” which are subtle drops in a star’s brightness caused when a planet passes directly across the face of its star from our perspective.
Eventually, astronomers noticed the planet’s schedule was becoming wildly erratic. TOI-2535 b was routinely arriving up to six hours early or six hours late for its scheduled transits. Then, in March 2026, the starlight dips stopped entirely, making the world seemingly vanished into the cosmic void.
Caught in a gravitational tug-of-war
New research reveals that TOI-2535 b hasn’t actually destroyed itself or fled the system. Instead, it is locked in an intense gravitational wrestling match with a second, hidden planet sharing the same system.
As the two neighboring worlds pull on one another, their orbits wobble. That wobble eventually became so severe that it tilted TOI-2535 b completely out of alignment with its star, shifting its path so it no longer crosses between the star and Earth’s line of sight.
“We think of the universe as resembling clockwork, where everything is regular, but that’s not true. If there are multiple planets in a system, they can affect each other’s orbits. We know of a few systems that are like this,” said study team member Samuel Yee of the University of California, Los Angeles, in a statement. “This is the most extreme example we’ve seen because the two planets are interacting so strongly. The planet’s orbit is tilting so quickly that its transit disappeared while we were watching.”
Researchers estimate that TOI-2535 b will not cross in front of its star again for at least 30 years. However, the elusive companion planet causing all the disruption may transit the star much sooner, potentially revealing itself to telescopes in the near future.
Rewriting the rules of planetary creation
The dramatic disappearance is giving scientists rare insight into how hot Jupiters come to exist. Because gas giants require massive amounts of ice to form, astronomers know they cannot originate so dangerously close to a scorching star. They must form farther out in the cold depths of space and migrate inward over time.
Scientists have long debated how this migration occurs:
- The Violent Route: A chaotic near-collision with another massive object flings the planet into an extreme oval-shaped orbit, and the star’s gravity slowly pulls it inward over time.
- The Gentle Route: The planet spirals inward slowly while settled inside a flat, disk-shaped cloud of gas and dust surrounding a newborn star, which is known as a protoplanetary disk.
Traditionally, astronomers assumed that planets moving inward via the gentle route would stay on a neat, flat orbital plane with minimal tilting. But the extreme twist observed in TOI-2535 b proves that flat planetary systems can become heavily tilted later in their lives without requiring a violent catastrophe.
“Because TOI-2535 b has a close neighbor, it probably migrated by slowly spiraling in instead of getting flung in,” Yee explained. “We may be seeing a formation channel that doesn’t happen very often but is very interesting.”
The team’s detailed findings were published on Monday, November 9, in The Astrophysical Journal Letters, giving astronomers a front-row seat to one of the most dynamic planetary systems ever observed.