Ryugu’s interaction with the sun changes what we know about asteroid history. In February and July of 2019, the Hayabusa2 spacecraft briefly touched down on the surface of near-Earth asteroid Ryugu. The readings it took with various instruments at those times have given researchers insight into the physical and chemical properties of 1-kilometer-wide asteroid. These findings could help explain the history of Ryugu and other asteroids, as well as the solar system at large.
When our solar system formed around 5 billion years ago, most of the material it formed from became the sun, and a fraction of a percent became the planets and solid bodies, including asteroids...
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