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.

Celestial News & Events

Another Interstellar Visitor Is Headed Our Way

An amateur astronomer has discovered a comet that might be the second interstellar visitor after 'Oumuamua — and it's heading for its closest approach to the Sun late this year.

'Oumuamua

Solar System

Was ‘Oumuamua a Fragment from a Disintegrated Comet?

A new study suggests that ‘Oumuamua’s strange trajectory back out to interstellar space can be explained if the object had the density of air.

'Oumuamua

Solar System

‘Oumuamua "Sped Up" in the Inner Solar System. This Might Be Why.

Astronomers think a jet-powered rocking motion could solve the puzzle.

Portrayal of 'Oumuamua (1I/2017 U1)

Solar System

'Oumuamua’s Story Keeps Spinning

Two new studies question the cometary nature of 'Oumuamua, our first interstellar visitor, and where in the Galaxy it might have come from.

'Oumuamua

Solar System

'Oumuamua Was a Comet After All

Researchers have found that 'Oumuamua — the first confirmed object to enter the solar system from interstellar space — was a comet, releasing just enough gas to subtly change its course.

Oumuamua painting by Hartmann

Solar System

Is ‘Oumuamua an Interstellar Pancake?

A new analysis of more than 800 telescopic observations suggests that our first known interstellar visitor could have the shape of a cigar or a fat disk.

Portrayal of 'Oumuamua (1I/2017 U1)

Solar System

`Oumuamua: Red, Tumbling, and Silent

Astronomers' recent observations of our first-known interstellar visitor reveal that it is very strange indeed.

Interstellar object `Oumuamua

Solar System

Meet 'Oumuamua, the Interstellar Cigar

Rapid-response observations by major observatories shows that the first-known interstellar visitor is 10 times longer than it is wide.

Distant visitor

Solar System

Update on `Oumuamua, Our First Interstellar Object

The arrival of an object from beyond the solar system caught astronomers by surprise — but that doesn't mean that they were unprepared to study it.

Orbit of Comet PanSTARRS (C/2017 U1)

Solar System

Astronomers Spot First-Known Interstellar "Comet"

Telescopes only picked it up a week ago, but it's likely been traveling through interstellar space for millions of years.

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