'Oumuamua is long gone, but it's still leaving scientists guessing. A new explanation proposes that the strange object was a "monstrous fluffy dust aggregate" produced by a busted-up comet.
Interstellar travel is the ability to travel between stars in the exploration of space. In science fiction, interstellar travel is often depicted as faster-than-light, such as warp drive on "Star Trek" or light speed in "Star Wars," but research is underway to build robotic probes for Alpha Centauri (as in the Breakthrough Starshot project), and to develop hibernation systems, generation ships and other long-duration space technology needed to one day send astronauts to other stars. Learn more about interstellar travel and technology.
Space.com's editors present a reading list for space and sci-fi lovers, as well as children who are interested in astronomy and spaceflight.
The proposed "Interstellar Probe" mission would aim to reach 90 billion miles (145 billion kilometers) from the sun, pushing the limits of engineering know-how and space technology.
A search for radio signals coming from 'Oumuamua, the mysterious visitor from afar that zoomed through the inner solar system last fall, came up empty, a new study reports.
Going, going — nope, it's still just going, NASA says of its Voyager 2 probe, which the agency realized was approaching the edge of the solar system back in early October.
Ever since astronomers first spotted their first-ever object from beyond our solar system, it has offered more questions than answers — what is it? Where did it come from? Why is it so darn weird?
Another interstellar asteroid has been spotted in our solar system — and this one is not a visitor but a long-term resident, a new study reports.
A pair of astronomers has mapped the 3D structure of an interstellar cloud in a surprising way: They watched it "sing" with magnetic vibrations.
How hard is it to hop to the nearest star system or soar across the galaxy? A typical "Star Trek" or "Star Wars" movie makes it look easy.
The solar system recently received its first interstellar visitor, 'Oumuamua, and researchers have now suggested a plan for a mission to meet the next guest from another star.
Some distant objects in our solar system bear the gravitational imprint of a small star's close flyby 70,000 years ago, a new study suggests.
Our solar system's first known interstellar visitor is likely even more alien than previously imagined, a new study suggests.