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Type: Interstellar object, Discovery Date: October 19, 2017, Unique Characteristics: First known interstellar object to pass through the Solar System, elongated shape, accelerated without cometary activity.

Type: Interstellar comet, Discovery Date: August 30, 2019, Unique Characteristics: Second interstellar object and first confirmed interstellar comet, showed visible cometary activity, relatively unaltered since its formation.

Type: Observation Method, Discovery Date: Employed since the advent of radio astronomy, Unique Characteristics: Radio telescopes can detect artificial radio signals or natural emissions, possibly indicating the presence or effects of extraterrestrial technology.

Type: Phenomenon, Discovery Date: Observed in 2017, Unique Characteristics: `Oumuamua showed non-gravitational acceleration, suggesting outgassing or another form of propulsion, but no cometary tail was observed.

Type: Organism, Discovery Date: Various discoveries since the 20th century, Unique Characteristics: These are organisms that thrive in extreme conditions on Earth, suggesting that life could potentially exist in a variety of environments in the universe.

Type: Concept, Discovery Date: Concept has evolved over time, Unique Characteristics: The region around a star where liquid water could exist on a planet's surface. The presence of a habitable zone is crucial for the possibility of life as we know it.

Type: Observatory, Discovery Date: Operational since 2010, Unique Characteristics: Discovered 1I/'Oumuamua using a 1.8-meter telescope, part of a system that scans the sky for transient phenomena and moving objects.

Type: Particle, Discovery Date: Ongoing discoveries, Unique Characteristics: Tiny solid grains from other star systems that are detected by their impact on spacecraft or via interstellar absorption lines in star spectra.

Type: Concept, Discovery Date: Identified with 'Oumuamua and Borisov, Unique Characteristics: Interstellar objects have hyperbolic trajectories indicating they are not gravitationally bound to the Sun and originate from outside the Solar System.