astronomy

Question 1

Ptolemy

Answer 1

was a mathematician, astronomer, geographer, and astrologer who wrote about a dozen scientific treatises.

Question 2

Copernicus

Answer 2

active as a mathematician, astronomer who formulated a model of the universe that placed the Sun rather than Earth at its center. Wikipedia

Question 3

Brahe, Tycho

Answer 3

made accurate observations of the stars and planets His study of the “new star” that appeared in 1572 showed that it was farther away than the Moon and was among the fixed stars

Question 4

Kepler, Johannes

Answer 4

laws of planetary motion, and his books Astronomia nova

Question 5

Galileo

Answer 5

telescope discoveries, he is perhaps most known for his discovery of the four most massive moons of Jupiter

Question 6

Newton, Isaac

Answer 6

well known for his discoveries in optics it is his formulation of the three laws of motion—the basic principles of modern physics

Question 7

Hubble, Edwin

Answer 7

crucial role in establishing the field of extragalactic astronomy and is generally regarded as the leading observational cosmologist

Question 8

Ursa major

Answer 8

a constellation in the northern sky, whose associated mythology likely dates back into prehistory.

Question 9

Ursa minor

Answer 9

the Little Bear, in astronomy, a constellation of the northern sky, at about 15 hours right ascension and 80° north declination, and seven of whose stars outline the Little Dipper.

Question 10

Orion

Answer 10

a prominent constellation located on the celestial equator and visible throughout the world named after Orion, a hunter in Greek mythology

Question 11

Cassiopeia

Answer 11

constellation in the northern sky named after the vain queen Cassiopeia, mother of Andromeda

Question 12

Red giant

Answer 12

a luminous giant star of low or intermediate mass in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K or lower.

Question 13

White Dwarf

Answer 13

what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage

Question 14

Main-sequence star

Answer 14

a continuous and distinctive band of stars that appears on plots of stellar color versus brightness

Question 15

Supernova

Answer 15

a powerful and luminous stellar explosion. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion

Question 16

Black hole

Answer 16

a region of spacetime where gravity is so strong that nothing no particles or even electromagnetic radiation such as light can escape from it.

Question 17

Parallax

Answer 17

the apparent displacement of an object because of a change in the observer’s point of view

Question 18

Light-year

Answer 18

alternatively spelled lightyear, is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers or 5.88 trillion miles

Question 19

Polaris

Answer 19

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

Question 20

Canis major

Answer 20

Major star is sirius 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