... Its mass is about 2 x 10 30 kg, consisting mainly of hydrogen (90%) and helium (10%). ... the Sun a continuous nuclear fusion is converting hydrogen into helium at a temperature of about 16 million degrees of Kelvin ...
... hydrogen, helium, and oxygen distribution in the upper atmosphere of Mars; . deuterium abundance in the Martian atmosphere; . ... DI 1215,3 A (neutral atomic deuterium); . HeI 584 A (neutral atomic helium); . OI 1304 A (neutral atomic oxygen); . ...
... The Sun gets its energy by combining protons (some of which convert to neutrons in the process) into helium, deep in the Sun's core; since the helium nucleus is an unusually stable combination of particles, energy is released in the process. ...
... is indeed very hot, so hot that the hydrogen and helium can escape gravitational attraction and form a steadily streaming ... 0.4 . 6.5 . 100 . Helium % . 0 . 5 . 25 . ...
... Such ions ("alpha particles," actually nuclei of helium) were also emitted by heavy ... Helium nuclei had twice the charge of the proton but 4 times the mass. ... For a while scientists wondered whether helium nuclei contained 4 protons and 2 ...
... There could be a small layer of liquid helium below the hydrogen, separated out gravitationally, and there is clearly some helium mixed in with the hydrogen. ...
... T he Sun is, at present, about 75% hydrogen and 25% helium by mass (92.1% hydrogen and 7.8% helium by number of atoms); everything else (" metals ") amounts to only 0.1%. ...
... Such ions ("alpha particles," actually nuclei of helium) were also emitted by heavy ... Helium nuclei had twice the charge of the proton but 4 times the mass. ... For a while scientists wondered whether helium nuclei contained 4 protons and 2 ...
... and "alpha particles" as completely ionized helium nuclei; a third component, "gamma ... find electrons and settle down as ordinary helium atoms, dispersed in the Earth's ...
... and "alpha particles" as completely ionized helium nuclei; a third component, "gamma ... find electrons and settle down as ordinary helium atoms, dispersed in the Earth's ...