La clasificación espectral de Yerkes, también llamada el sistema MKK por las iniciales de los autores, es un sistema de clasificación espectral estelar introducido en 1943 por William Wilson Morgan, Philip C. Keenan, y Edith Kellman del Observatorio Yerkes. [12] Este esquema de clasificación bidimensional (temperatura y luminosidad) se basa en líneas espectrales …

A planetary system is a set of gravitationally bound non-stellar objects in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals and circumstellar disks.

Issue 51 (released February 22, 2017) Issue 52 (released March 22, 2017) ... Wind Sock endured mockery from the pegasi as he worked on designing a machine to let him fly. When one Wonderbolt, Dauntless, became stranded at the bottom of a canyon filled with winds too strong for any pegasus to navigate, Wind Sock built a glider that allowed him ...

IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus.It is just luminous enough to be seen with the unaided eye, at a distance of about 154 light years from the Solar System. The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity.It is categorized as a Delta Scuti variable star and it has a periodic cycle of …

Gliese 504 b (often shortened to GJ 504 b) is considered by NASA to be a Jovian planet and it is located in the system of the solar analog 59 Virginis (GJ 504), discovered by direct imaging using HiCIAO instrument and AO188 adaptive optics system on the 8.2-meter Subaru Telescope of Mauna Kea Observatory, Hawaii by Kuzuhara et al. Visually, GJ 504 b would have a magenta …

Une naine blanche [1], [2], [3] est un objet céleste de forte densité, issu de l'évolution d'une étoile de masse modérée (de trois à quatre masses solaires au maximum [4]) après la phase où se produisent des réactions thermonucléaires.Cet objet a alors une taille jusqu'à 8 fois moindre, et conserve longtemps une température de surface élevée, d'où son nom de « naine blanche ».

En terrestrisk planet, tellurisk planet eller steinplanet er en planet som hovedsakelig er oppbygd av silikatbergarter.Uttrykket kommer av det latinske ordet for jorda, Terra.Uttrykket innebærer dermed at disse planetene er «jordliknende». Terrestriske planeter er vesentlig forskjellige fra gasskjempene, som ikke har faste overflater og som hovedsakelig er oppbygd av hydrogen, …

In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.Each line indicates a particular chemical element or molecule, with the line strength …

Güneş Sistemi, Güneş'in kütleçekim kuvvetiyle yörüngede tutulan ve çeşitli gök cisimlerinden oluşmuş bir sistemdir. Güneş ve 8 gezegen ile onların doğruluğu onaylanmış 150 uydusu, 5 cüce gezegen (Ceres, Plüton, Eris, Haumea, Makemake) ile onların bilinen toplam 8 uydusu ve milyarlarca küçük gök cisminden oluşur. Küçük cisimler kategorisine asteroitler, Kuiper ...

Fifty-seven navigational stars and additionally the star Polaris are given a special status in the field of celestial navigation.Of the approximately 6,000 stars visible to the naked eye under optimal conditions, these selected stars are among the brightest and span 38 constellations of the celestial sphere from the declination of −70° to +89°. Many of the selected stars were …