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International Space mission Science & Technology

A five-layer sunshield and an orbit a million and a half kilometres out: the telescope that works at L2

The James Webb Space Telescope is a joint NASA/ESA/CSA mission, launched in 2021.
Webb studies every phase in the history of the Universe, from the first luminous glows after the Big Bang to the formation of solar systems and the evolution of our own Solar System.
It does not orbit around the Earth like the Hubble Space Telescope. It orbits the Sun 1.5 million kilometers from the Earth, at what is called the second Lagrange point, or L2.
Hubble, by comparison, orbits 560 kilometers above the Earth.
Webb has a 5-layer sunshield that protects the telescope from the infrared radiation of the Sun, Earth and Moon.
One of its most recognizable features is its large, segmented, gold-coated mirror.
Scientists, engineers and technicians from 14 countries contributed to the design, build, test, integration, launch, commissioning and operations of Webb.
Assembly and testing of the mirror and instruments occurred at NASA Goddard Space Flight Center.

Partner agencies: NASA, ESA and CSA Distance from Earth: 1.5 million kilometers Orbital position: Second Lagrange point, L2 Sunshield layers: 5 Hubble's orbit for comparison: 560 kilometers above the Earth
Why it matters for exams: Questions on space telescopes turn on where the instrument sits, and the contrast between Hubble's low Earth orbit and Webb's position at L2 is the standard discriminator.
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23 October 2026 Source: NASA Science

In plain words

L2 Second Lagrange point — A point beyond the Earth where the gravity of the Sun and Earth lets a spacecraft keep station with little fuel.

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