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the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light.

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A device that produces a focused spectrum.

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A telescope that has a lens for the objective.

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A telescope that has a mirror for its objective.

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When spectral lines move toward the longer-wavelength part (red end) of the spectrum.

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The person that came up with the geocentric model for the Solar system

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A way to use mathematics to calculate the distance to a far away object such as a star.

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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.

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The person that agreed with both Copernicus and Galileo but modified Copernicus’s model to elliptical orbits instead of circular orbits.

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An adaptive telescope that uses computers to change the shape if the mirror to correct for “twinkling” and resolve much more detail than ever before.

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A model of the universe that places the Sun at the center with Earth, the planets, and moons revolving around it.

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A model of the universe that places Earth at the center with the Sun, moons and planets revolving around it.

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The person that built the first refracting telescope to help prove Copernicus’s model

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A set of axes of any kind that is used to describe the positions or motions of things.

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The phenomenon that the observed frequency of a wave changes if the source of the wave and the observer are moving toward or away from one another.

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Contains dark lines on a rainbow coloured background. Produced when white light passes through an cooler gas and absorbs or removes some of the colours of light.

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The person that came up with the heliocentric model for the solar system

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Contains all the colours blending into one another. It is produced by heating a gas at an high pressure.

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A device used to measure a object’s azimuth

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An emission or bright line spectrum has bright lines on an black background. It is produced when you heat a gas at low pressure.

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Blue Shifted: When a light source is travelling towards us, it is blue shifted, means shorter waves

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Is the scientific study of celestial objects such as stars and planets.

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Belief which hold that the relative positions of celestial bodies can provide useful information about human affairs.

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Is an device used to measure the altitude of a object

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Is the angle measured above the horizon in degrees when measuring altitude-azimuth coordinates

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Is the angle measured clockwise from north when measuring altitude-azimuth coordinates