Helium planets would have a white or grey hue. (Artist's conception shown.)
A helium planet is a planet with a helium-dominated atmosphere. This contrasts with ordinary gas giants such as Jupiter and Saturn, whose atmospheres consist primarily of hydrogen, with helium as a secondary component only. Helium planets might form in a variety of ways. Gliese 436 b is a possible helium planet.
A heliumplanet is a planet with a helium-dominated atmosphere. This contrasts with ordinary gas giants such as Jupiter and Saturn, whose atmospheres...
throughout the planet if the planet is hot enough. In "traditional" giant planets such as Jupiter and Saturn (the gas giants) hydrogen and helium make up most...
lists of planets. A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation...
hydrogen into helium in a shell surrounding an inert helium core red-clump stars in the cool half of the horizontal branch, fusing helium into carbon in...
A gas giant is a giant planet composed mainly of hydrogen and helium. Jupiter and Saturn are the gas giants of the Solar System. The term "gas giant"...
A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of...
Stellar nucleosynthesis has occurred since the original creation of hydrogen, helium and lithium during the Big Bang. As a predictive theory, it yields accurate...
hydrogen into helium at its core, releasing this energy from its outer photosphere. The largest objects that orbit the Sun are the eight planets. In order...
possible heliumplanet. In June 2015, scientists reported that the atmosphere of Awohali was evaporating, resulting in a giant cloud around the planet and...
a list of planet types by their mass, orbit, physical and chemical composition, or by another classification. The IAU defines that a planet in the Solar...
processes occur, preventing any supernova explosions. Once the Sun stops fusing helium in its core and ejects its layers in a planetary nebula in about 8 billion...
In astronomy, a disrupted planet is a planet or exoplanet or, perhaps on a somewhat smaller scale, a planetary-mass object, planetesimal, moon, exomoon...
(Am, CP1) magnetic (Ap, CP2) non-magnetic mercury-manganese (HgMn, CP3) helium-weak (He-weak, CP4). The class names provide a good idea of the peculiarities...
burning helium in their cores. Depending on mass and chemical composition these stars gradually move blue wards until they exhaust the helium in their...
later become a main-sequence star at the onset of hydrogen fusion producing helium. The modern picture of protostars, summarized above, was first suggested...
three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen...
surface. The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8%, respectively, of the mass of the Sun...
A helium star is a class O or B star (blue), which has extraordinarily strong helium lines and weaker than normal hydrogen lines, indicating strong stellar...
helium, but still massive enough to fuse deuterium – less than about 0.08 M☉ and more than about 13 Jupiter masses. Chandrasekhar limit Dwarf planet...
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic...
are one of the most important classes of pulsating star. They are core-helium burning stars with masses above about 5 solar masses. They principally oscillate...
Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless...
convective. Hence, the helium produced by the thermonuclear fusion of hydrogen is constantly remixed throughout the star, avoiding helium buildup at the core...
systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural...
after hydrogen, helium, and oxygen. Marc Kuchner and Sara Seager coined the term "carbon planet" in 2005 and investigated such planets following the suggestion...
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