DEC 25 — The James Webb Space Telescope, a Nasa instrument designed to allow humankind’s first glimpse of the infant universe as it existed when the earliest galaxies are believed to have formed, was set for launch on Saturday from the northeastern coast of South America.
Over the following month, the Webb telescope will coast to its destination in solar orbit roughly 1 million miles from Earth – about four times farther away than the moon. Webb’s special orbital path will keep it in constant alignment with Earth as the planet and telescope circle the sun in tandem. Webb mainly will view the cosmos in the infrared spectrum, allowing it to peer through clouds of gas and dust where stars are being born, while Hubble has operated primarily at optical and ultraviolet wavelengths.The new telescope’s primary mirror – consisting of 18 hexagonal segments of gold-coated beryllium metal – also has a much bigger light-collecting area, enabling it to observe objects at greater distances, thus farther back into time, than Hubble or any other telescope.
Aside from examining the formation of the earliest stars and galaxies in the universe with greater clarity, astronomers are eager to study super-massive black holes believed to occupy the centres of distant galaxies.
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