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AST 101 Exam 3 Study Guide – Astronomy Exam Review & Revision Notes

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Exam (elaborations)

AST 101 Exam 3 Study Guide – Astronomy Exam Review & Revision Notes

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11 pages

2026/2027

Institution AST 101

Course AST 101

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Prepare for your AST 101 Exam 3 with this astronomy exam preparation resource. Designed for students reviewing introductory astronomy concepts, reinforcing their understanding of course material, and preparing for their third assessment. Use this study resource to organise your revision, revisit important course concepts, and strengthen your understanding of astronomy before the exam. Ideal for students searching for AST 101 Exam 3 study guides, astronomy exam review materials, and revision notes. Course: AST 101 – Astronomy Assessment: Exam 3 Purpose: Exam preparation and revision Format: PDF study material

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AST/./101/./Exam/./3/./Questions/./With/./Verified/./Answers
the/./visible/./surface/./of/./the/./Sun;/./underneath/./the/./chromosphere/./-
/./correct/./answer/./✔ ✔ photosphere

Before/./the/./Sun/./was/./a/./star,/./it/./was/./a/./hot/./cloud/./of/./____/./____/./-
/./correct/./answer/./✔ ✔ Hydrogen/./gas

Gravity/./slowly/./contracted/./the/./gas/./that/./made/./up/./the/./sun,/./making/./it/./__
__/./and/./____/./-/./correct/./answer/./✔ ✔ denser/./and/./hotter

___/./___/./is/./the/./contraction/./that/./occurs/./in/./the/./formation/./of/./a/./star/./until/./
a/./balance/./is/./achieved/./between/./the/./___/./___/./___/./and/./the/./___/./___/./___/./-
/./correct/./answer/./✔ ✔
hyrdrostatic/./equilibrium;/./outward/./thermal/./pressure;/./inward/./gravitatio
nal/./force

While/./in/./hydrostatic/./equilibrium/./the/./Sun/./neither/./___/./nor/./___/./-
/./correct/./answer/./✔ ✔ contracts;/./expands

The/./high/./___/___/./in/./the/./Sun's/./core/./permits

, nuclei/./to/./fuse/./-/./correct/./answer/./✔ ✔ temperature;/./pressure

In/./nuclear/./fusion,/./4/./protons/./of/./hydrogen/./fuse/./to/./form..././-
/./correct/./answer/./✔ ✔ 1/./helium/./and/./energy

4/./steps/./of/./nuclear/./fusion/./in/./the/./Sun/./(the/./proton-proton/./chain)/./-
/./correct/./answer/./✔ ✔
1)/./2/./protons/./fuse/./to/./make/./deuterium/./nucleus/./(occurs/./twice)
2)/./deuterium/./nucleus/./and/./a/./proton/./fuse/./(from/./gamma/./ray)/./to/./make/./he
lium-3/./(occurs/./twice)
3)/./Two/./helium-3/./fuse/./to/./form/./helium-4,/./releasing/./2/./protons

Deuterium/./nucleus/./-/./correct/./answer/./✔ ✔
has/./one/./proton/./and/./one/./neutron

nuclear/./fusion/./is/./a/./___/./___/___/./process/./-/./correct/./answer/./✔ ✔
self/./sustaining/correcting

Parts/./of/./the/./Sun's/./structure/./-/./correct/./answer/./✔ ✔
inner/./core,/./radiative/./core,/./convection/./zone,/./subsurface/./flows,/./photos
phere,/./chromosphere,/./corona

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Uploaded on: October 12, 2026
Number of pages: 11
Written in: 2026/2027
Type: Exam (elaborations)
Contains: Questions & answers

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