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Interstellar medium The distribution of ionized hydrogen (known by astronomers as H II from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible from the Earth's northern hemisphere as observed with the Wisconsin Hα Mapper (Haffner et al. 2003). In astronomy, the interstellar medium (or ISM) is the matter that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, dust, and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space. The energy that occupies the same volume, in the form of electromagnetic radiation, is the interstellar radiation field.
Interstellar medium
The distribution of ionized hydrogen (known by astronomers as H II from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible from the Earth’s northern hemisphere as observed with the Wisconsin Hα Mapper (Haffner et al. 2003).
In astronomy, the interstellar medium (or ISM) is the matter that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, dust, and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space. The energy that occupies the same volume, in the form of electromagnetic radiation, is the interstellar radiation field.
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sal·a·man·der (săl′ə-măn′dər) n. 1. Any of various small, tailed amphibians of the order Caudata, having porous scaleless skin and usually two pairs of limbs of equal size, found chiefly in northern temperate regions. 2. a. A mythical creature, generally resembling a lizard, believed capable of living in or withstanding fire. b. In the occult philosophy of Paracelsus, a being having fire as its element.
sal·a·man·der (săl′ə-măn′dər)
n.
1. Any of various small, tailed amphibians of the order Caudata, having porous scaleless skin and usually two pairs of limbs of equal size, found chiefly in northern temperate regions.
2.
a. A mythical creature, generally resembling a lizard, believed capable of living in or withstanding fire.
b. In the occult philosophy of Paracelsus, a being having fire as its element.
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camp·fire (kămp′fīr′) n. 1. An outdoor fire in a camp, used for cooking or warmth: sat around the campfire, telling scary stories. 2. A meeting held around such a fire.
camp·fire (kămp′fīr′)
n.
1. An outdoor fire in a camp, used for cooking or warmth: sat around the campfire, telling scary stories.
2. A meeting held around such a fire.