Astronomy

Question 1

Ptolemy

Answer 1

believed that earth was the center of the universe and the planets and sun revolved around the earth

Question 2

Copernicus

Answer 2

believed that the sun is the center of the universe and all the planets revolved around the sun

Question 3

Brahe, Tycho

Answer 3

recorded very precise observations of the planets and stars

Question 4

Kepler, Johannes

Answer 4

used brahe’s work to determine that all the planets revolve aroung the sun in elliptical orbits

Question 5

Galileo

Answer 5

used a telescope to make important discoveries about the moon and sun

Question 6

Newton, Isaac

Answer 6

deiscovered that all objects in the universe attract each other through gravitational force

Question 7

Hubble, Edwin

Answer 7

proved that other galaxies exist beyond the milky way

Question 8

Ursa major

Answer 8

a constellation of the northern sky

Question 9

Ursa minor

Answer 9

the group of stars that includes the north pole of the heavens and the stars which form the Little Dipper with the North Star at the tip of the handle. called also Little Bear.

Question 10

Orion

Answer 10

: a group of stars in the sky that looks like a hunter with a line of three bright stars for a belt

Question 11

Canis major

Answer 11

stars that look like a greater dog.

Question 12

Cassiopeia

Answer 12

a northern group of stars between Andromeda and Cepheus.

Question 13

Red giant

Answer 13

a 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

a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula.

Question 15

Main-sequence star

Answer 15

any star that has a hot, dense core which fuses hydrogen into helium to produce energy

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 space having a gravitational field so intense that no matter or radiation can escape.

Question 18

parallax

Answer 18

the effect whereby the position or direction of an object appears to differ when viewed from different positions, e.g. through the viewfinder and the lens of a camera.

Question 19

Light-year

Answer 19

a unit of astronomical distance equivalent to the distance that light travels in one year,

Question 20

polaris

Answer 20

the bright star almost directly above the North Pole