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Black-body radiation is the thermal electromagnetic radiation within, or surrounding, a body in thermodynamic equilibrium with its environment, emitted by a black body (an idealized opaque, non-reflective body).
Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun.
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).
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.
This is a list of well-known online encyclopedias that are accessible or formerly accessible on the Internet.. The largest online encyclopedias are general reference works, though there are also many specialized ones.
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:
A black hole is a massive, compact astronomical object so dense that its gravity prevents anything from escaping, even light.Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. [2]
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 ...