Comet Borisov

Solar System

Interstellar Comet Was Pristine Sample of Planet Formation

New analysis shows that Comet 2I/Borisov, which zipped nearest the Sun in late 2019, was unlike any comet we’ve seen before.

Portrayal of 'Oumuamua (1I/2017 U1)

Solar System

Can We Expect Seven Interstellar Visitors Per Year?

A new study estimates the number of interstellar objects that fly through the inner solar system every year, and it could be quite a lot.

Comet 2I/Borisov

Solar System

The Origins of Interstellar Objects

The first two interstellar visitors to the solar system are finally shedding light on their places of origin.

Comet Borisov

Solar System

Is the Interstellar Comet 2I/Borisov Breaking Up?

New observations of the interstellar comet — which traveled unaltered for eons before arriving in the solar system — have revealed it's fragmenting

Comet Borisov at perihelion

Solar System

Hubble Images Comet Borisov at Perihelion

The Hubble Space Telescope imaged the interstellar comet 2I/Borisov when it came closest to the Sun before heading back out of the solar system.

Comet 2I/Borisov

Solar System

Interstellar Comet Borisov "Indistinguishable" from Solar System Comets

The solar system's newest interstellar visitor, Comet 2I/Borisov, bears a striking resemblance to the icy population of the outer solar system.

Interstellar Comet Borisov

Explore the Night with Bob King

Will Amateurs Be Able to See the New Interstellar Comet?

Only the second object thus far to visit the solar system from interstellar space, Comet Borisov is expected to reach perihelion in December. What can we see now?

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