dniijwq Flashcards
Ptolemy
Believed that Earth was the center of the universe and the planets and sun revolved around the earth
Copernicus
believed that the sun is in the center of the universe and all the planets revolved around the sun
Brahe, Tycho
Recorded very precise observations of the planets and stars
Kepler, Johannes
Used Brahe’s work to determine that all the planets revolve around the sun in elliptical orbit
Galileo
Used a telescope to make important discoveries about the moon and sun
Newton, Isaac
Discovered that all objects in the universe attract each other through gravitational force
Hubble, Edwin
Proved that other galaxies exist beyond the milky way
Ursa major
Ursa Major is a constellation in the northern sky, whose associated mythology likely dates back into prehistory
Ursa minor
Ursa Minor, also known as the Little Bear, is a constellation located in the far northern sky
Orion
a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous and recognizable constellations in the night sky. It is named after Orion, a hunter in Greek mythology
Canis major
Canis Major is a constellation in the southern celestial hemisphere. In the second century, it was included in Ptolemy’s 48 constellations, and is counted among the 88 modern constellations.
Cassiopeia
Cassiopeia is a constellation in the northern sky named after the vain queen Cassiopeia, mother of Andromeda, in Greek mythology,
Red giant
A red giant is a dying star in the final stages of stellar evolution. In about five billion years, our own sun will turn into a red giant, expand and engulf the inner planets — possibly even Earth
White dwarf
what stars like the Sun become after they have exhausted their nuclear fuel.
Main-sequence star
any star that has a hot, dense core which fuses hydrogen into helium to produce energy.
Supernova
a powerful and luminous explosion of a star.
Black hole
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 theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
Parallax
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.
Light-year
the distance light travels in one year
Polaris
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.
