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The unit of measurement used is the light-year (distance traveled by light in one Julian year; approximately 9.46 trillion kilometres). This list includes superclusters, galaxy filaments and large quasar groups (LQGs). The structures are listed based on their longest dimension.
The product of Simon Newcomb's J1900.0 mean tropical year of 31 556 925.9747 ephemeris seconds and a speed of light of 299 792.5 km/s produced a light-year of 9.460 530 × 10 15 m (rounded to the seven significant digits in the speed of light) found in several modern sources [10] [11] [12] was probably derived from an old source such as C. W ...
The first aurora beyond the Solar System is reported, on a brown dwarf 18 light years from Earth. [323] Astronomers report the discovery of HD 219134 b, a rocky exoplanet, due to its size of 1.6 Earth and density of 6 g/cm 3, that is the closest such exoplanet to Earth, at 21.25 light-years away. [324] [325]
The first direct image of what the shape of a photon would look like is created. [467] [468] 15 November – Measles cases are reported to have surged across the world, with an estimated 10.3 million infections in 2023, a 20% increase from 2022. [469]
A notable example of the observer effect occurs in quantum mechanics, as demonstrated by the double-slit experiment. Physicists have found that observation of quantum phenomena by a detector or an instrument can change the measured results of this experiment.
It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something called the Rayleigh effect, or Rayleigh scattering. But that same ...
Astronomers report that 6% of all dwarf stars – the most common stars in the known universe – may host Earthlike planets. Additionally, some such exoplanets may exist only 13 light-years from Earth. [97] Scientists discover live bacteria in the subglacial Antarctic Lake Whillans. [98] 8 February
The most remote galaxy ever detected – GN-z11 – is confirmed by the Hubble Space Telescope at a distance of 13.4 billion light years. [70] The global average temperature briefly spikes 2 degrees C above the pre-industrial average, considered by most countries to be the "dangerous" limit for climate change. [71] [72]