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Runaway Stars in our Galaxy
Astronomers have observed "hypervelocity stars" moving so fast through our galaxy that they will eventually escape the Milky Way's gravity. Astronomical research suggests that they may have been accelerated by a close encounter with massive black hole in the center of the nearby Large Magellanic Cloud, throwing them like a slingshot through our own galaxy.

Volcanic Deposits on Mercury from Deep Inside Planet
Some of the mysterious volcanic features on Mercury appear to have formed at the boundary between its core and mantle. Mercury's core is only 400 km below its surface, making it unique in the solar system.

How Mars' Moons Formed
Two new studies indicate that Mars' moons Phobos and Deimos formed during a giant collision between Mars and a protoplanet.

Juno Arrives at Jupiter
After an almost five-year journey to the solar system’s largest planet, NASA's Juno spacecraft successfully entered Jupiter’s orbit on July 4. Juno's principal goal is to understand the origin and evolution of Jupiter., by investigating the existence of a solid planetary core, mapping Jupiter's intense magnetic field, measuring the amount of water and ammonia in the deep atmosphere, and observing the planet's auroras. The mission also will let us take a giant step forward in our understanding of how giant planets form and the role these titans played in putting together the rest of the solar system.

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