NASA’s Roman Space Telescope will use gravity as a magnifying glass to find distant planets
NASA's Nancy Grace Roman Space Telescope will utilize the phenomenon of gravitational microlensing to detect distant exoplanets. By using the gravity of foreground stars to magnify light from background stars, the telescope can identify planets that are otherwise invisible.
Why it matters
This mission expands our ability to discover and study planetary systems that current detection methods cannot reach.
NASA’s Nancy Grace Roman Space Telescope launched on Aug. 30, 2026, beginning a journey that will take it about a million miles from the Earth. Once there, Roman will study some of the biggest mysteries in astronomy, from dark energy to the formation of galaxies. It will also search for planets around other stars , called exoplanets, but in a rather unusual way.
Roman will be able to find many of these exotic worlds without seeing the planets themselves. Instead, it will watch for distant stars that temporarily become brighter.
The reason this strategy works is one of the stranger consequences of Einstein’s theory of gravity: Gravity can bend light. Under the right circumstances, a star – or even a planet – can behave like a natural magnifying glass. The phenomenon is called gravitational microlensing .
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