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The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets)
Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
Stars in the night sky appear to be attached to a dark background, the celestial dome Kepler, Johannes. Mysterium Cosmographicum, 1596.Kepler's heliocentric rendition of the cosmos, containing an outermost "sphaera stellar fixar," or sphere of fixed stars.
True color image of the Trifid Nebula, showing complex gas and plasma structure. A nebula (Latin for 'cloud, fog'; [1] pl.: nebulae, or nebulas [2] [3] [4] [5]) is a ...
The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.
Astronomy (from the Greek ἀστρονομία from ἄστρον astron, "star" and -νομία -nomia from νόμος nomos, "law" or "culture") means "law of the stars" (or "culture of the stars" depending on the translation).
Euler diagram showing the IAU Executive Committee conception of the types of bodies in the Solar System.. The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, [1] a planet is a celestial body that:
Ensiklopedi umum dalam bahasa Indonesia (English: General encyclopedia in the Indonesian language) is a single volume Indonesian-language general encyclopedia published in 1954 by Bulan Bintang. [1] [2] [3] It was written solely by Adi Negoro. [4] It is claimed to be the second Indonesian encyclopedia that was the work of a single person. [5]