Astronomers and Stars

Question 1

Ptolemy

Answer 1

thought earth was the center of the universe

Question 2

Copernicus

Answer 2

instead of the Earth being the center he thought the sun was the center of the universe

Question 3

Tycho Brahe

Answer 3

made precise measurements with big instruments

Question 4

Kepler

Answer 4

made laws of planetary motion

Question 5

Galileo

Answer 5

discovered mountains and craters on the moon using a telescope

Question 6

Isaac Newton

Answer 6

Discovered gravity

Question 7

Edwin Hubble

Answer 7

The universe is actually way bigger than just the milky way

Question 8

Ursa Major

Answer 8

constellation in the northern celestial hemisphere

Question 9

Ursa Minor

Answer 9

also known as the Little Bear, is a constellation in the northern sky

Question 10

Orion

Answer 10

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 was named after Orion, a hunter in Greek mythology

Question 11

Canis Major

Answer 11

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.

Question 12

Cassiopeia

Answer 12

a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty.

Question 13

Red Giant

Answer 13

very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.

Question 14

White Dwarf

Answer 14

also called a degenerate dwarf, is a stellar remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is comparable to that of Earth.

Question 15

Main- Sequence Star

Answer 15

a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs. White dwarfs no longer burn fusion at their center, but they still radiate heat

Question 16

Supernova

Answer 16

a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.

Question 17

Black Hole

Answer 17

a region of spacetime exhibiting such strong gravitational effects that nothing—including particles and electromagnetic radiation such as light—can escape from inside it.

Question 18

Parallax

Answer 18

displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

Question 19

Light Year

Answer 19

a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).

Question 20

Polaris

Answer 20

brightest star in the constellation Ursa Minor.