Search results
Results from the WOW.Com Content Network
As defined by the International Astronomical Union (IAU), the light-year is the product of the Julian year [note 1] (365.25 days, as opposed to the 365.2425-day Gregorian year or the 365.24219-day Tropical year that both approximate) and the speed of light (299 792 458 m/s).
To help compare different distances this section lists lengths starting at 10 16 m (10 Pm or 66,800 AU, 1.06 light-years). 15 Pm – 1.59 light-years – possible outer radius of Oort cloud; 20 Pm – 2.11 light-years – maximum extent of influence of the Sun's gravitational field [citation needed] 30.9 Pm – 3.26 light-years – 1 parsec
Distance light travels in one day — Light-year: 63 241 — Distance light travels in one Julian year (365.25 days) — Oort cloud: 75 000: ± 25 000: Distance of the outer limit of Oort cloud from the Sun (estimated, corresponds to 1.2 light-years) — Parsec: 206 265 — One parsec. The parsec is defined in terms of the astronomical unit, is ...
A light-year is the distance light travels in one Julian year, around 9461 billion kilometres, 5879 billion miles, or 0.3066 parsecs. In round figures, a light year is nearly 10 trillion kilometres or nearly 6 trillion miles. Proxima Centauri, the closest star to Earth after the Sun, is around 4.2 light-years away. [89]
With the release of Gaia's observations of the star, it has since been refined to a much closer 0.178 light-years (0.055 pc), close enough to significantly disturb objects in the Oort cloud, which extends 1.2 light-years (0.37 pc) from the Sun. [74] Gaia 's third data release has provided updated values for many of the candidates in the table ...
an object of diameter 45 866 916 km at one light-year, an object of diameter one astronomical unit (149 597 870.7 km) at a distance of one parsec, per the definition of the latter. [7] One milliarcsecond is about the size of a half dollar, seen from a distance equal to that between the Washington Monument and the Eiffel Tower.
For objects within the immediate neighborhood of the Sun, the absolute magnitude M and apparent magnitude m from any distance d (in parsecs, with 1 pc = 3.2616 light-years) are related by = = (), where F is the radiant flux measured at distance d (in parsecs), F 10 the radiant flux measured at distance 10 pc.
The Bubble Nebula (NGC 7635) at left with about 520 cubic light years (4.4 × 10 50 m 3) dwarfs the Dumbbell Nebula's 12 cubic light years (1 × 10 49 m 3) (very approximate figures) The globular cluster Messier 5 at upper left with about 2 million cubic light years (1.7 × 10 54 m 3) dwarfs the much smaller Bubble Nebula at lower right.