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Definitions (472)

1.

6   4

Molecular velocity


The average speed of the molecules in a gas of a given temperature.
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4   6

Solar maximum


The midpoint in the solar cycle where the amount of sunspot activity and the output of cosmic particles and solar radiation is highest.
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2   3

Solar minimum


The beginning and the end of a sunspot cycle when only a few sunspots are usually observed, and the output of particles and radiation is normal.
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2   1

Nuclear transformation


The process by which an atomic nucleus is transformed into another type of atomic nucleus. For example, by removing an alpha particle from the nucleus, the element radium is transformed into the eleme [..]
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1   1

Wavelength


The distance between two wave crests. Radio waves can have lengths of several feet; the wavelengths of X-rays are roughly the size of atoms.
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Temperature


A measure of the amount of heat energy in a substance, such as air, a star, or the human body. Because heat energy corresponds to motions and vibrations of molecules, temperature provides information [..]
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Radioactivity


The spontaneous decay of certain rare, unstable, atomic nuclei into more stable atomic nuclei. A natural by-product of this process is the release of energy.
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Gigabyte


A measure of computer data storage capacity equal to approximately a billion bytes. In computer language, a byte of information represents a letter or digit. So, a billion bytes is equal to a billion [..]
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Milky Way galaxy


The Milky Way, a spiral galaxy, is the home of Earth. The Milky Way contains more than 100 billion stars and has a diameter of 100,000 light-years.
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Primordial nucleosynthesis


Element building that occurred in the early universe when the nuclei of primordial matter collided and fused with one another. Most of the helium in the universe was created by this process.
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