The Parker Solar Probe, reaching a speed of 532,000 km/h, is the fastest man-made object, but it is still very slow compared to other celestial bodies in the universe.
Illustration of a pulsar, one of the fastest-rotating objects in the universe. Image: SA/JPL-Caltech
According to current human knowledge, the fastest things in the universe are photons of light, followed by subatomic particles in particle accelerators or high-energy astronomical events. However, these are too small to observe. Instead, the search for the fastest object that is large enough to be seen with the naked eye is perhaps more interesting, IFL Science reported on April 20.
The universe is expanding. This means everything is moving further apart. The farther an object is, the faster it is moving away. Therefore, for humans, the fastest moving object in the universe may also be the farthest. But this record is constantly being broken, especially with the emergence of new tools like the James Webb Space Telescope. Since last year, when it began operating, the James Webb telescope has discovered several "new candidates" for the title of the farthest galaxy, and there will certainly always be more such candidates.
However, to any inhabitants (if any) living within those galaxies, they are not moving fast at all. They would only see some very distant galaxies moving, their own galaxy appearing to remain stationary, and nearby galaxies moving very slowly. To simplify, the search for the fastest and largest objects visible to the naked eye would be limited to those moving fastest relative to nearby objects.
Humanity's fastest creation, the Parker Solar Probe, reaches a speed of 532,000 km/h relative to the Sun and is expected to travel 30% faster if all goes wrong. However, this speed is still extremely slow compared to the speeds at which some planets orbit their host stars. For example, SWIFT J1756.9-2508b, a likely exoplanet, orbits its pulsar in less than an hour. This means its average speed is about 766 km per second, or about 0.2% the speed of light.
Black holes orbiting each other can achieve much faster speeds, but scientists usually only detect this from gravitational waves after they merge. One exception is the two black holes in the galaxy PKS 2131-021. Currently, it still takes them two years to orbit each other, but this process is accelerating.
If linear motion is considered, some stars are flung out of the galaxy due to being too close to supernovae or being part of a three-dimensional “gravitational dance.” Among these, the fastest star known to science moves at nearly 1,000 kilometers per second relative to the galaxy.
However, all the objects that experts have discovered of this type are very far from Earth, meaning they have only observed very large and bright objects. It is possible that dimmer stars, or even planets, are also ejected in a similar way and move much faster because they experience the same repulsive force but have smaller masses.
Another noteworthy object is PSR J1748-2446ad – a pulsar rotating 716 times per second located in the globular cluster Terzan 5. This pulsar has an estimated radius of about 16 km. This means its equator is moving at approximately 70,000 km per second, equivalent to 24% the speed of light, an impressive figure.
According to IFL Science/VNE
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