James Webb was launched in December to succeed the revolutionary – but now ageing – Hubble Space Telescope. A tiny rock fragment has hit the new James Webb Space Telescope’s main mirror. The damage inflicted by the dust-sized micrometeoroid is producing a noticeable effect in the observatory’s data but is not expected to limit the mission’s overall performance. The speed at which things move through space means even the smallest particles can impart a lot of energy when colliding with another object. Webb has now been hit five times with this latest event being the most significant. How can the telescopes be protected ?

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