IMAP (NASA)

Explain Like I'm 10

What is it? A 900 kg spacecraft that measures particles from the Sun and maps the boundary of the heliosphere, the bubble that helps shield the solar system from cosmic rays.
Why does it matter? Earlier warnings of solar radiation protect astronauts, satellites and the technology we rely on, and IMAP's maps show how the heliosphere shields life in the solar system.

The Five W's of IMAP

Who

NASA, which runs IMAP as an active heliophysics mission.

What

A 900 kg spacecraft that measures particles from the Sun and maps the boundary of the heliosphere, the bubble that helps shield the solar system from cosmic rays.

Source: NASA, IMAP mission

When

Launched September 24, 2025, together with NOAA's space weather satellite; now operating at L1.

Source: NASA, IMAP launch release

Where

The Sun–Earth L1 , about one million miles from Earth toward the Sun.

Source: NASA, IMAP mission

Why

Earlier warnings of solar radiation protect astronauts, satellites and the technology we rely on, and IMAP's maps show how the heliosphere shields life in the solar system.

Source: NASA, IMAP mission

Impact Statement

Agency solution · active

NASA's IMAP (Interstellar Mapping and Acceleration Probe) launched on September 24, 2025 and works from the Sun–Earth L1 point, about one million miles from Earth toward the Sun. From there it can give astronauts and spacecraft near Earth about a half hour's warning of harmful radiation, and its I-ALiRT real-time link shares space weather data with forecasters.

Source: NASA, IMAP mission

Source: NASA, IMAP launch release

For Further Information: NASA, IMAP mission