How NASA's Nancy Grace Roman Space Telescope will open a window into the Milky Way
Look up at the night sky with the naked eye and it may seem like it rarely changes. Yet the universe is in constant flux. Stars drift through space, orbiting the center of the Milky Way as planets orbit them. They rotate, showing spots on their surfaces and sometimes producing violent outbursts that affect planetary atmospheres much like solar storms produce auroras on Earth.
NASA's Nancy Grace Roman Space Telescope, named after the agency's first chief of astronomy and first female executive, is set to revolutionize our understanding of the Milky Way. This next-generation telescope combines sharp images, a vast field of view, and repeated observations to reveal the dynamic nature of our cosmos.
The telescope is often seen as the successor to the Hubble Space Telescope, boasting a mirror identical in size to Hubble's. However, it can observe a much larger patch of the sky – up to 200 times larger than Hubble's. This broad view enables Roman to monitor millions of objects simultaneously, unlike previous telescopes that faced challenges with spatial resolution.
Roman's unique capability lies in its ability to observe changes over time. By repeatedly imaging the same patches of sky, it can track phenomena unfolding on timescales from hours to years. This includes observing distant events like supernovae and monitoring our own Milky Way's central bulge, where thousands of stars are obscured by gas and dust. Roman's high-resolution, near-infrared observations will allow astronomers to study these stars in unprecedented detail, uncovering their rotation periods and other properties.
The telescope will employ two core surveys: the High-Latitude Time-Domain Survey, focusing on distant phenomena such as supernovae, and the Galactic Bulge Time-Domain Survey, dedicated to observing the Milky Way's crowded center. The galactic bulge survey will use a technique called microlensing, where the gravity of a passing object warps and magnifies light from a distant star, revealing its presence.
Roman will also discover planets using the transit method, where planets dim the light of their stars as they pass in front of them.
By tracking the light of objects over time, Roman can distinguish patterns, revealing what's happening throughout the universe. From supernovae in distant galaxies to the smallest stars in our own, the Nancy Grace Roman Space Telescope promises to open a window into a cosmos that is constantly changing.
Written by urgent.news from Phys.org's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
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