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22 cze 2024 · A light year is the distance light travels in one year, which is about 31,557,600 light seconds. How many light years across is the Milky Way? The Milky Way galaxy is estimated to be about 100,000 light years in diameter.
4 dni temu · The star, whose mass is roughly half that of the Sun, is currently 62 light-years from the Solar System. It was first noticed in 1999 using data from the Hipparcos satellite, and was estimated to pass less than 1.3 light-years (0.40 pc) from the Sun in 1.4 million years.
3 dni temu · It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224. Andromeda has a D 25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years) and is approximately 765 kpc (2.5 million light-years) from Earth.
9 lip 2024 · Light year: It’s not a year, or an amount of time at all. It’s the distance light travels in one year. It’s the same as 5,878,499,810,000 miles (or 9,460,538,400,000,000 meters). When things are very far away, it’s easier to talk about their distance in light years than millions or billions or trillions of miles.
3 dni temu · (A light-year is the distance traversed by light in one year, traveling at a velocity of 300,000 km per second [km/sec], or 650,000,000 miles per hour.) These so-called superclusters are separated by nearly empty voids, and this causes the gross structure of the universe to look somewhat like a network of sheets and chains of galaxies.
4 dni temu · The very smallest dust clouds are the so-called Bok globules, named after the Dutch American astronomer Bart J. Bok; these objects are about one light-year across and have masses of 1–20 solar masses.
28 cze 2024 · Let each tick on the vertical axis represent one light-year (9.46 × 10 17 cm [5.88 × 10 12 miles]) of distance in the direction of the flight of the photon, and each tick on the horizontal axis represent the passage of one year (3.16 × 10 7 seconds) of time. The propagation path of the photon is then a 45° line because it flies one light ...
