 On August 30, 2019, amateur astronomer Gennady Borozov discovered a new comet, now named after him. We covered comets in our How Far Away Is It segment on comets and the heliosphere, where we pointed out that there are two sources for comets in our solar system, the Kuiper Belt and the Oort Cloud. These two sources rotate in the solar system plane, as do the comets they produce. But this comet has entered in the inner solar system from a very steep angle. This has led astronomers to conclude that it is from another solar system. The comet made its closest approach to the sun on December 7. It's traveling at over 155,000 km per hour. That's over 96,000 miles per hour. It's following a hyperbolic path and by the middle of 2020 it will be on its way back into interstellar space. Hubble photographed the comet in October at a distance of approximately 420 million kilometers from Earth. That's 260 million miles. Its tail marks it as cometary. This nucleus has a radius of about one kilometer or six tenths of a mile, a common size for solar system comets. The nucleus is dominated by dust with traces of gas like our solar system comets. And the material it ejects travels at speeds similar to ejecta from solar system comets, suggesting a similar process. All in all it appears remarkably similar to solar system comets even though it formed in a distant star system.