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International Science Science & Technology

A telescope that orbits the Sun, not the Earth, from a point a million miles out

The James Webb Space Telescope is the largest and most powerful telescope ever launched to space, and it is operated as a partnership of NASA, the European Space Agency and the Canadian Space Agency.
It studies every phase in the history of the Universe, from the first luminous glows after the Big Bang to the formation of solar systems capable of supporting life, and it is designed to peer back in time over 13.5 billion years to the first galaxies born after the Big Bang.
Unlike the Hubble Space Telescope, it does not orbit the Earth; it orbits the Sun 1.5 million kilometers, or 1 million miles, away from the Earth, at the second Lagrange point, called L2.
Its observatory design is so large that it had to fold origami-style to fit inside the rocket and unfold in space.
It carries a 5-layer sunshield that protects the telescope from the infrared radiation of the Sun, Earth and Moon.
Its most recognizable feature is a large, segmented, gold-coated mirror.
Among its instruments is NIRCam, the Near-Infrared Camera, which has been used to pick out the faint host galaxies of distant events.

Partners: NASA/ESA/CSA Orbit: Around the Sun, at the second Lagrange point (L2) Distance from Earth: 1.5 million kilometers Sunshield: 5-layer Look-back time: Over 13.5 billion years
Why it matters for exams: The L2 orbit is the one fact that separates Webb from Hubble in an objective paper, and the three-agency partnership is the usual second question.
Kerala PSCUPSC
20 October 2026 Source: NASA

In plain words

L2 Second Lagrange point — A point beyond the Earth where a spacecraft can keep station with the Earth as both go round the Sun.

NIRCam Near-Infrared Camera — Webb's camera for near-infrared light, used for its deepest images.

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