Astronomy - Sp7

Question 1

What different bodies are part of the solar system

Answer 1

stars, planets, moons

Question 2

Order of the planets?

Answer 2

Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune

Question 3

When was Ptolemy’s Model introduced?

Answer 3

150 CE

Question 4

What was Ptolemy’s model about?

Answer 4

he put forth a geocentric model (meaning the solar system revolved around the earth)
planets move in circles

Question 5

When was Copernicus’ model introduced?

Answer 5

1543

Question 6

What was Copernicus’ model about?

Answer 6

heliocentric model (sun at centre)
everything orbits around sun as it is largest

Question 7

When was the telescope invented

Answer 7

1608

Question 8

Who was the telescope invented by?

Answer 8

Galileo

Question 9

What did Galileo discover?

Answer 9

4 of Jupiter’s moon
- motioning their movements he deciphered that not everything orbits around earth (smaller objects go around larger objects)

Question 10

Additional cosmic bodies?

Answer 10

Uranus + Neptune discovered
dwarf planet Pluto discovered 1940s (demoted 2014)
asteroids (mostly found between mars + Jupiter)
comets (made of ice)

Question 11

What are satellites ?

Answer 11

a body that orbits the earth or another cosmic body

Question 12

what is an example of a natural satellite?

Answer 12

moons

Question 13

what is an example of artificial satellites?

Answer 13

GPS satellite, Sky TV satellites, international space station

Question 14

What is in the current solar system model

Answer 14

8 planets
5 dwarf planets
1000’s comets
millions of asteroids

Question 15

What is the direction of movement of planets around the sun?

Answer 15

elliptical movement

Question 16

What factors effect the gravitational field of an object?

Answer 16

mass + radius

Question 17

Why does gravity have different values on different planets

Answer 17

depends on the mass of the body creating the field, The larger the mass of the body, the stronger its gravitational field

Question 18

Why does the velocity of a planet changes even if orbiting at a steady speed?

Answer 18

Constantly changing direction which means velocity changes

Question 19

How is the radius of a stable orbit affected by the orbital speed

Answer 19

If the speed of the object changes, the radius does too (e.g. faster moving objects = smaller radius)