Solar wind a major driver of atmospheric sodium at Mercury

No object in the solar system experiences the sun's solar wind more powerfully than Mercury. The planet's magnetic field deflects the sun's stream of electrically charged particles at a distance of only 1,000 kilometers from ...

Vision changes in space

Understanding the effects of microgravity on the human body is essential in enabling astronauts to travel through the harsh environment of space for months, or even years. Significant changes to the body's skeletal and muscle ...

Hubble views an interacting spiral

This image, taken by the Wide Field and Planetary Camera 2 on NASA's Hubble Space Telescope, features the spiral galaxy NGC 3509. Located some 350 million light-years away, NGC 3509 is an interesting galaxy whose sweeping ...

Hubble looks at a face-on grand spiral

This image from NASA's Hubble Space Telescope features the Grand Design Spiral, NGC 3631, located some 53 million light-years away in the direction of the constellation Ursa Major. The "arms" of grand design spirals appear ...

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