What is Nebula? What is astronomy?
What is comets?
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They were among the first solid bodies to form in the solar nebula, the collapsing interstellar cloud of dust and gas out of which the Sun and planets formed. ... A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail.
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- A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.
- Astronomy is the study of the sun, moon, stars, planets, comets, gas, galaxies, gas, dust and other non-Earthly bodies and phenomena. ... Below we discuss the history of astronomy and related fields of study, including cosmology.
- Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. ... When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets.
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