Oumuamua, the first object from another star system to be observed in our solar system, has some unusual characteristics. It is as big as a football field and has a peculiar shape that makes it difficult to classify. Some scientists think that Oumuamua’s light indicates ice on its surface, while others say it could be made up of metals or compounds like water.
It’s not a comet
Oumuamua is not even a comet. Instead, it’s an asteroid—an icy object made of rock and metal that has never been seen before in our solar system (though we do know that other planetary systems have them). Asteroids are usually more spherical than comets because they don’t have enough gravity to pull in gases like water vapor and carbon dioxide.
Asteroids also tend to move much more slowly than comets, which means they’re easier for astronomers to track from the Earth with telescopes like those at NASA’s Jet Propulsion Laboratory (JPL). The fact that Oumuamua was moving so quickly relative to its size suggested something unusual about its origin or trajectory; it could be either an asteroid ejected out of another star system or possibly even an interstellar object itself!
‘Oumuamua has unusual proportions
Oumuamua is an unusual object in many ways. It’s elongated, dark and bright. It’s also very large: The first recorded measurement of Oumuamua was made by astronomers using the Hubble Space Telescope, who found that it was approximately 1 km (0.6 miles) long—about 100 times as long as any asteroid previously observed in our Solar System!
Oumuamua also has unusual proportions compared to most comets or asteroids that we’ve seen before: Its perihelion distance is about 0.4 AU or 45 million kilometers from Earth—that’s closer than Mercury!
Originated in the Lyra constellation
Oumuamua may have originated in the Lyra constellation. The Lyra constellation is a good candidate for Oumuamua’s origin because it’s found near the center of our Milky Way galaxy, which makes it likely that other stars within this region are very old. This is not just an idle speculation either: In fact, some scientists think that an object from another star system could have been ejected into our own galaxy by gravitational forces acting on it as it passed by another star in its migration through space.
Its brightness increased over time
The object’s brightness increased over time, which is unusual for an asteroid but is consistent with comets.
Asteroids are considered to be solid objects that have not been altered by impacts or other processes and therefore don’t change their surface properties over time. However, the way in which Oumuamua changed its brightness from initial observations through September 2018 suggests that it may have been a comet rather than an asteroid at some point during its journey through space.
If Oumuamua were indeed a comet—which would make sense given how much we know about their composition—then there are several possible explanations for why this happened: ice sublimation (where water vaporizes into gas), thermal emission from the surface (which could heat up different parts of the body along different axes), or even spin rate changes caused by gravity forces acting on this tiny spacecraft as it traveled around our star system with others like it before eventually coming into contact with Earth’s atmosphere.
Close approach to another star in 2017
Oumuamua is a comet. It was first observed in October 2017, when it passed through our solar system and was detected by astronomers on Earth. It’s the first interstellar object to be observed by astronomers, who were able to get detailed measurements of its size and chemical makeup.
The name Oumuamua means “first messenger.” The term “messenger” comes from how this object moved through space after being ejected from another star system (also known as an exoplanet). This can happen when planets collide or break apart; if enough mass falls onto one side of the object’s center of gravity—like if you threw a rock onto a balance scale—it will tip over so that one end rises higher than the other (if there were no friction between them).
THE CHRONICLES UNKNOWN 