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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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First-Ever Microlensing Planet Discovered by NASA's TESS Surprises Astronomers

Astronomers have discovered a giant planet in an unexpected way, proving that even missions designed for one purpose can make remarkable discoveries in completely different areas of space science. The newly found world, named Gaia23bra b, is the first gravitationally bound planet detected through gravitational microlensing by NASA's Transiting Exoplanet Survey Satellite (TESS).

This exciting discovery not only adds another giant exoplanet to the growing list of known worlds but also reveals that TESS can do much more than scientists originally imagined. By combining data from multiple telescopes, researchers have shown that TESS can help find planets hidden in distant parts of our galaxy using one of Einstein's most fascinating predictions.

A Different Way to Find Planets

Most exoplanets discovered so far have been found using the transit method, where a planet passes in front of its star and slightly blocks its light. TESS was specifically built to use this technique and has already discovered thousands of planet candidates.

However, Gaia23bra b was found using a completely different method called gravitational microlensing.

According to Einstein's theory of general relativity, gravity can bend light. When a star passes directly in front of another distant star, its gravity acts like a giant cosmic magnifying glass, temporarily making the background star appear brighter.

If the foreground star has a planet orbiting it, that planet creates an extra disturbance in the light, producing a unique signature that astronomers can detect. This technique is especially valuable because it can discover planets that are too far from their stars to be found by the transit method.

An Unexpected Observation

The discovery began when the Gaia Science Alerts system detected an unusual brightening event known as Gaia23bra. At first, scientists believed it was caused by a single star acting as a gravitational lens.

By chance, NASA's TESS happened to be observing the same region of the sky during two consecutive observing periods, called sectors.

Unlike the initial observations, TESS recorded much more detailed changes in brightness. The spacecraft captured distinctive features known as caustic crossings, which are clear signs that the lensing object is actually a two-body system rather than a single star.

These unexpected observations completely changed scientists' understanding of the event.

Combining Data for a Clearer Picture

Researchers combined observations from both Gaia and TESS using advanced computer modeling software. These programs carefully recreated the light curve—the way the brightness changed over time—to determine what kind of objects caused the microlensing event.

The analysis revealed that the foreground object is a K-type dwarf star, a slightly smaller and cooler star than our Sun.

The star has about 79% of the Sun's mass, making it a stable, long-lived star.

Orbiting this star is a giant planet approximately 1.6 times the mass of Jupiter, placing it firmly in the category of gas giants.

Scientists estimate that the planet lies at a projected distance of about 4.8 astronomical units (AU) from its star. One AU is the average distance between Earth and the Sun, meaning this giant planet orbits even farther out than Mars and is located at a distance similar to Jupiter's orbit in our own Solar System.

Why This Discovery Matters

Gaia23bra b is important for several reasons.

First, it is the first gravitationally bound microlensing planet ever detected by TESS, demonstrating that the spacecraft can contribute to an entirely new field of astronomy.

Second, microlensing allows astronomers to detect planets that are otherwise extremely difficult to find. Many gas giants orbit far from their stars, making them unlikely to pass directly in front of their stars from Earth's perspective. These planets often remain invisible to transit surveys.

Microlensing fills this gap by allowing scientists to detect planets regardless of the direction of their orbits.

This means researchers can build a more complete picture of how planetary systems form and evolve throughout the Milky Way.

Looking Beyond the Galactic Bulge

Traditionally, most microlensing searches focus on the Galactic Bulge, the densely packed central region of the Milky Way where millions of stars create ideal conditions for microlensing events.

However, Gaia23bra b was discovered along the Galactic Plane, a much broader region stretching across the sky.

This suggests that TESS's nearly all-sky coverage can help astronomers discover planets in areas that have received far less attention from traditional microlensing surveys.

Expanding searches into these regions could reveal many more hidden planetary systems and improve our understanding of the distribution of planets across the galaxy.

The Power of Teamwork in Space

One of the most exciting aspects of this discovery is the collaboration between different space missions.

The European Space Agency's Gaia mission first identified the unusual brightening event, while NASA's TESS provided continuous, high-frequency observations that revealed the planet's signature.

Researchers then combined these observations with sophisticated modeling software to reconstruct the planetary system.

This demonstrates how modern astronomy increasingly relies on combining information from multiple telescopes rather than depending on a single observatory.

Each mission contributes a different piece of the puzzle, allowing scientists to make discoveries that would otherwise be impossible.

A New Future for TESS

Although TESS was never designed primarily as a microlensing observatory, this discovery highlights its hidden potential.

Because TESS continuously monitors large sections of the sky with frequent observations, it can accidentally capture rare microlensing events that other telescopes might miss.

Scientists now believe TESS could become an important supporting tool for future microlensing research, especially when working alongside missions such as Gaia and upcoming observatories dedicated to exoplanet discovery.

As more archived TESS data are analyzed, astronomers may uncover additional hidden planets waiting to be discovered.

Expanding Our Search for Other Worlds

The discovery of Gaia23bra b reminds us that the universe often surprises scientists. A spacecraft built to detect planets using one technique has now successfully contributed to finding a planet using a completely different method.

This breakthrough expands the scientific value of TESS and demonstrates how innovative analysis of existing observations can unlock entirely new discoveries.

As astronomers continue to combine data from multiple space missions, they are uncovering more of the Milky Way's hidden planetary population. Each new discovery helps answer one of humanity's biggest questions: How common are planetary systems like our own?

With Gaia23bra b, scientists have taken another important step toward solving that mystery, showing that even the most unexpected observations can reveal entirely new worlds hidden among the stars.

Reference: Mallory Harris et al., "TESS’s First Bound Microlensing Planet—A Binary Microlensing Event Revealing a Planetary Companion toward the Galactic Plane", 2026 ApJL 1005 L33. https://iopscience.iop.org/article/10.3847/2041-8213/ae7a50

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