Topic: Space
Scientists have found a new way to detect oceans on exoplanets by looking for their 'glint'. Researchers from the University of Arizona used a computer tool to model how light would behave when reflecting off an ocean. This could help NASA's next great observatory spot oceans on distant worlds.
We've discovered over 5,500 exoplanets so far, and some of them are in habitable zones where they could host an ocean. But we've never found a liquid ocean on another planet for sure. A new paper from researchers Eleanor Cornish and Tyler Robinson looks at a unique way to find one—by looking for its 'glint'.
Glint is when sunlight hits water at a low angle and the horizon lights up with a brilliant flash of gold. But most things on exoplanets don't glint like this, except for water. When light bounces off water at a shallow angle, it reflects strongly.
In 2009, NASA's Cassini spacecraft detected a specular glint off the hydrocarbon lakes on Titan. And in the past, scientists used a Galileo flyby of Earth to spot glint reflecting off our own oceans. But we haven't done this for exoplanets yet. That might be about to change.
The researchers turned to an atmospheric tool and modified it for detecting glint. They incorporated a model that shows how wind speeds and wave ripples would affect the light reflected back to a telescope. And they found that, even at high noise thresholds, the model could tell if a planet had an ocean or not, provided it was viewed at a phase angle of more than 120°.
This is good news for telescope designers, especially those working on the Habitable Worlds Observatory (HWO). They can use this method to spot oceans on distant worlds.
Why It Matters
Understanding how to detect oceans on exoplanets could help us find life beyond Earth. It's also a step towards building better telescopes that can study our universe in more detail.
Key Facts
- Over 5,500 exoplanets have been discovered so far.
- Researchers from the University of Arizona found a new way to detect oceans on exoplanets by looking for their 'glint'.
- The method could help NASA's next great observatory spot oceans on distant worlds.
- The Habitable Worlds Observatory (HWO) will use this method to study exoplanets.
- Glint is when sunlight hits water at a low angle and the horizon lights up with a brilliant flash of gold.
Key Terms
- Exoplanet
- A planet that orbits a star outside our solar system
- Specular reflection
- When light bounces off a surface at a shallow angle and reflects strongly
Implications
Understanding how to detect oceans on exoplanets could help us find life beyond Earth. It's also a step towards building better telescopes that can study our universe in more detail.
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