Topic 2: Planetary Systems

Question 1

What’s the perihelion?

Answer 1

When a planet/object Is closest to sun

Question 2

What’s the aphelion?

Answer 2

When a planet/object is furthest from sun

Question 3

What’s the greatest elongation?

Answer 3

When a planet is the furthest point away from the sun, using earth as its reference point (search up image lol)

Question 4

What’s conjunction?

Answer 4

When 2 events happen at the same time or you can see 2 or more objects in the sky at one like when you can see Venus and the sun - they in conjunction

Question 5

What’s opposition?

Answer 5

When 2 objects are in opposite ends of the sky usually from Earth

Question 6

What’s transit?

Answer 6

When a celestial object passes over another eg a solar eclipse

Question 7

What’s occultation?

Answer 7

When a celestial body is hidden behind another object eg the sun in a total solar eclipse

Question 8

What’s the equation t^2=r^3

Answer 8

T=orbital period R= distance from sun

When given t:
Square it
Cube root it
= R
When given R
Cube it
Square root it
= t