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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.

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.

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

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{radiation astronomy resources}} template. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

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To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!




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



Complete the text:

Cosmogony is a term which admits some

or, at least,



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



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


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



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



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.



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



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



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.



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

See also[edit]

External links[edit]