He began to suspect that our solar system’s history had been anything but smooth—that it had somehow endured a “global gravitational instability,” as he now calls it. In 2004 he gathered ...

She mapped our solar system's "alternate ... "If we discover a solar system-like system, but with a slightly different history—where instead of the natural belt, there is a planet—could ...

In fact, it takes more than four years for light to travel from the nearest star to our solar system. Meanwhile ... compiled it into a short animated map and timeline called "4000 Exoplanets ...

Ten years ago, astronomers from various institutions, including NASA and SETI (Search for ExtraTerrestrial Intelligence), set out to map the asteroid belt by ... are among the oldest materials in our ...