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emission nebulae and reflection nebulae.
hot stars and interstellar gas, particularly hydrogen
Two well know nebulae are the Crab and Horsehead nebulae.
hydrogen and helium
Eagle Nebula Orion Nebula
emission nebulae and reflection nebulae.
emission nebulae and reflection nebulae.
emission nebulae and reflection nebulae.
hot stars and interstellar gas, particularly hydrogen
Two well know nebulae are the Crab and Horsehead nebulae.
Ionized hydrogen and helium are the most abundant chemical elements in nebulae.
hydrogen and helium
There are two meteor showers: The Geminids on December 13-14 and the Epsilon Geminids on October 18 - 29. There are two planetary nebulae: The Eskimo and Medusa nebulae. There is an open cluster M35 (NGC 2168).
Eagle Nebula Orion Nebula
Cloudless climes and starry skies. Bright and dark.
The nucleus of the atom decays, and in the process, the nucleus transforms into another element, or into an isotope or isomer of the same element. In radioactive decay, the nucleus always emits some kind of particle(s). It is the high-energy emission of these particles that we call radiation. There are many different types of radioactive decay:Alpha decay results in the emission of an alpha particle (two neutrons and two protons)Beta decay results in the emission of a beta particle (an electron or a positron)Neutron decay results in the emission of a neutronProton decay results in the emission of a protonGamma decay results in the emission of a gamma particle (a photon)Neutrino decay results in the emission of a neutrino or antineutrinoIn some cases, a combination of the above emissions takes place. For example in double beta decay, a single nucleus emits two electrons and two antineutrinos in the same event.
The noun 'nebula' is singular, a word for one cloud of interstellar gas and dust.There are two accepted forms for the plural: nebulae and nebulas.