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Claudius Ptolemy was a Roman mathematician, astronomer, astrologer, geographer, and music theorist,

Nicolaus Copernicus was a Renaissance polymath, active as a mathematician, astronomer, and Catholic canon, who formulated a model of the universe that placed the Sun rather than Earth at its center

generally called Tycho was a Danish astronomer, known for his comprehensive and unprecedentedly accurate astronomical observations

Johannes Kepler was a German astronomer, mathematician, astrologer, natural philosopher and writer on music.

was an Italian astronomer, physicist and engineer, sometimes described as a polymath.

Edwin Powell Hubble was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy

Ursa Major is a constellation in the northern sky, whose associated mythology likely dates back into prehistory. Its Latin name means “greater bear,” referring to and contrasting it with nearby Ursa Minor, the lesser bear

Orion is a prominent constellation located on the celestial equator and visible throughout the world.

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Canis Major is a constellation in the southern celestial hemisphere. In the second century

Cassiopeia is a constellation in the northern sky named after the vain queen Cassiopeia,

A red giant is a luminous giant star of low or intermediate mass in a late phase of stellar evolution

what stars like the Sun become after they have exhausted their nuclear fuel

In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness

A supernova occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion

A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape its event horizon.

the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object. motion

the distance light travels in one year

Polaris is a star in the northern circumpolar constellation of Ursa Minor. It is designated α Ursae Minoris and is commonly called the North Star or Pole Star