A ghost-like transit detected between galaxies marks a new frontier
In short: Astronomers have detected a mysterious, invisible passage between our galaxy and another. While most exoplanets are found in our own cosmic backyard, new techniques are allowing us to spot worlds in distant galaxies, revealing that the universe is far more populated than we once thought.
Until recently, our knowledge of exoplanets—planets outside our solar system—was largely confined to our own Milky Way. Almost all known candidates were located within about 3,000 light-years of Earth. However, researchers have now detected signs of a planet transiting a star in the Messier 51 (M51) galaxy, also known as the Whirlpool Galaxy. This discovery is significant because M51 is approximately 28 million light-years away, making this world thousands of times farther than previous detections.
The breakthrough relies on a shift in observation strategy. While missions like Kepler and TESS search for dips in visible light, this study used NASA’s Chandra X-ray Observatory to monitor X-ray bright binaries. These systems involve a neutron star or black hole pulling gas from a companion star, causing the material to superheat and glow in X-rays. Because the X-ray-producing region is so small, a passing planet can block nearly all of the radiation, creating a much more distinct and detectable 'dip' than it would in visible light.
Situated within the M51-ULS-1 binary system, this particular planet-like object circles a secondary star weighing roughly 20 times as much as the Sun. This method opens a new arena for discovery, potentially allowing scientists to identify planets in other galaxies by looking for these dramatic X-ray disappearances. This technique bypasses the limitations of optical light studies, which struggle to detect the tiny fractions of light blocked by planets at such immense distances.
Beyond individual planets, our view of galactic interactions is also evolving. Observations of a 'cosmic joust' show galaxies colliding at 500 km/s, where one galaxy pierces another with radiation from a quasar. This radiation is powerful enough to dampen the wounded galaxy's ability to form new stars, providing a rare look at how galactic violence reshapes the internal structures of gas and matter across 11 billion years of history.
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Sources
- Summary by Intellect · source: Something Never Before Seen Passed Between Us and Another Galaxy
- Also: Chandra Sees Evidence for Possible Planet in Another Galaxy - NASA
- Also: 'Cosmic joust': Astronomers observe pair of galaxies in deep-space battle | ScienceDaily
- Also: www.space.com — Andromeda Galaxy: Facts about our closest galactic neighbor | Space
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