Stars/Sun/Heliogony/Quiz

Heliogony is a lecture and an article focusing on the origin of the Sun. It is a lecture as part of the radiation astronomy course on solar astronomy.

This is an artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. Credit: ESO/L. Calçada.

You are free to take this quiz based on heliogony at any time.

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Quiz

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Ignore the questions' coefficients:

1 True or False, The Sun is the third most abundant entity in the solar system.

	TRUE
	FALSE

2 Complete the text:

Cosmogony is a term which admits some or, at least, .

3 True or False, As Jupiter's orbit is not in the plane of the Sun's equator, Jupiter may have formed elsewhere.

	TRUE
	FALSE

4 What effects does the distribution of angular momentum in the solar system have on the origin of the Sun?

	an initially spherical and contracting nebula spinning faster as it collapses would produce the present situation in the solar system
	partitioning mass and angular momentum does not seem possible with a contracting nebula
	the rotation axis of the Sun from that of the system as a whole if formed by nebular collapse seems very unlikely
	the angular-momentum problem does not arise with the accretion theory
	surface differential rotation of the Sun results
	by the nature of the floccule process the star so formed will have little angular momentum

5 Complete the text:

Match up the structure of the proto-Sun with the heliogonic characteristic or property:

radiative zone - L

core - M

convection zone - N

dynamo - O

tachocline - P

photosphere - Q

atmosphere - R

temperature region - S

chromosphere - T

transition region - U

corona - V

heliosphere - W

apparent outer surface .

just above the radiative zone .

top of the radiative zone .

part of the heliosphere .

below the corona and above the photosphere .

below the protostar's radiative zone .

coolest layer in the protoplanetary disc .

shear between different parts of the Sun that rotate in the radiative zone .

above the photosphere .

transition from almost uniform to differential between radiative and convective zones .

probably not differentiated as a protostar .

between the protoplanetary disc and the heliosphere .

6 Yes or No, The German philosopher Kant was the first to conceive the idea that the Sun originated as a condensation from a nebula.

	Yes
	No

7 True or False, At a certain critical stage a contracting nebula would have a lenticular shape with equatorial material in orbit around a central mass.

	TRUE
	FALSE

8 Yes or No, An initially spherical and contracting nebula would spin faster as it collapsed.

	Yes
	No

9 True or False, The apparent outstanding failure of the early nebula theory was in explaining the distribution of angular momentum in the solar system.

	TRUE
	FALSE

10 Yes or No, The planets, with 0.13 per cent of the mass of the system, account for about 99.5 per cent of its angular momentum and no spontaneous way of so partitioning mass and angular momentum seems possible.

	Yes
	No

Hypotheses

Main resource: Hypotheses

1. Questions regarding the origin of the Sun should also address star-forming regions along the Sun's galactic orbit.

See also

• Astrognosy/Quiz
• Heliocentric astronomy quiz
• Heliogony quiz
• Heliography quiz
• Heliology quiz
• Heliometry quiz
• Heliophysics quiz
• Heliosphere quiz

External links

{{Radiation astronomy resources}}