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Components of the Universe and Big Bang Theory

Across
It includes living things, planets, stars, galaxies, dust clouds, light, and even time.
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
A type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.
Thermal radiation left over from the time of recombination in Big Bang cosmology.
They are also sometimes known as gas giants.
A contracting mass of gas that represents an early stage in the formation of a star, before nucleosynthesis has begun.
A small rocky body orbiting the sun.
Down
A small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
The thermal radiation left over from the time of recombination in Big Bang cosmology.
A very large star of high luminosity and low surface temperature.
About 90 percent of the stars in the universe, including the sun, are this.
a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun
A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
Decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift.
A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.