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The James Webb Space Telescope (JWST), launched in December 2021, represents a quantum leap in our ability to observe the universe. Unlike its predecessor, the Hubble Space Telescope, which primarily observes in visible light, Webb is designed to see the cosmos in infrared. This capability allows it to peer through the dusty clouds where stars and planetary systems are being born. Furthermore, because the universe is expanding, light from the earliest stars has been stretched into infrared wavelengths, making Webb the only tool capable of seeing the first light after the Big Bang. Its primary mirror, composed of 18 hexagonal gold-plated beryllium segments, is far larger than Hubble's, granting it unprecedented sensitivity. Astronomers expect JWST to revolutionize our understanding of exoplanets' atmospheres, potentially detecting biosignatures that could indicate the presence of extraterrestrial life.
What is the main idea of the passage?
The James Webb Space Telescope is a replacement for the Hubble Telescope focused on visible light.
The primary mirror of JWST is made of gold-plated beryllium segments.
JWST's infrared capabilities and design allow it to explore the universe's origins and exoplanets in ways Hubble could not.
The expansion of the universe stretches light into infrared wavelengths.
Astronomers have found biosignatures on exoplanets using the JWST.