Question

astronomy study guide
name:
period:

1. solar flares are ejected from
2. the aurora borealis and aurora australis are caused by (explain):
3. the ____ is created by the spinning of the earth’s core. this creates the ____ which helps protect the earth from the sun harmful solar radiation.

earth’s motions
sketch the earth’s axial position and tilt in relation to the sun for the four seasons and label: spring, fall, summer, and winter. this question will count for four questions, one for each season plus axis.
stars
define:

1. big bang theory
2. nebular theory

Explanation:

Question 26: Explanation of Aurora Borealis and Aurora Australis Causes

Auroras (Aurora Borealis in the Northern Hemisphere, Aurora Australis in the Southern Hemisphere) are caused by solar wind particles interacting with Earth’s magnetic field and atmosphere. Here’s the breakdown:

1. Solar Wind Emission: The Sun emits a stream of charged particles (protons, electrons) called solar wind.
2. Magnetic Field Interaction: Earth’s magnetic field (magnetosphere) channels these charged particles toward the polar regions (North and South Poles).
3. Atmospheric Collision: When these particles collide with gas molecules (e.g., oxygen, nitrogen) in the upper atmosphere (ionosphere/thermosphere), the gases become excited.
4. Photon Release: As the excited gas molecules return to their normal energy state, they release energy as photons (light), creating the colorful auroral displays.

Question 27: Filling the Blanks

The first blank refers to the magnetic field (created by the spinning of Earth’s liquid iron core). The second blank refers to the ozone layer (which absorbs harmful ultraviolet (UV) solar radiation, protecting Earth from excessive UV exposure).

Earth’s Motions: Sketching Seasons

To sketch Earth’s axial position and tilt relative to the Sun for seasons:

1. Axial Tilt: Earth’s axis is tilted at ~23.5° relative to its orbital plane (ecliptic).
2. Seasonal Positions:

• Summer (Northern Hemisphere): Earth’s North Pole tilts toward the Sun → longer days, more direct sunlight.
• Winter (Northern Hemisphere): Earth’s North Pole tilts away from the Sun → shorter days, less direct sunlight.
• Spring/Fall (Equinoxes): Earth’s axis is neither tilted toward nor away from the Sun → nearly equal day/night globally.
• Label each position with the season and draw the axis tilt (dashed line) for clarity.

Stars: Defining Theories

1. Big Bang Theory: A scientific model describing the origin of the universe. It proposes the universe began as an extremely hot, dense singularity ~13.8 billion years ago and has been expanding and cooling ever since (supported by cosmic microwave background radiation, redshift of galaxies, etc.).
2. Nebular Theory: Explains the formation of the solar system. It states that the Sun and planets formed from a rotating cloud of gas and dust (a nebula) that collapsed under gravity. Over time, the nebula flattened into a disk, with the Sun forming at the center and planets accreting from the disk’s material.

Final Answers (Key Fill-Ins/Definitions)

• Q26: Auroras are caused by solar wind particles interacting with Earth’s magnetic field and atmospheric gases.
• Q27: The magnetic field is created by Earth’s core spinning; the ozone layer protects from harmful solar radiation.
• Earth’s Seasons: Tilt (23.5°) and orbital position determine seasons (toward/away from Sun for summer/winter, equinoxes for spring/fall).
• Big Bang Theory: Universe originated from a hot, dense singularity ~13.8 billion years ago.
• Nebular Theory: Solar system formed from a collapsing gas/dust nebula.

Answer:

Question 26: Explanation of Aurora Borealis and Aurora Australis Causes

Auroras (Aurora Borealis in the Northern Hemisphere, Aurora Australis in the Southern Hemisphere) are caused by solar wind particles interacting with Earth’s magnetic field and atmosphere. Here’s the breakdown:

1. Solar Wind Emission: The Sun emits a stream of charged particles (protons, electrons) called solar wind.
2. Magnetic Field Interaction: Earth’s magnetic field (magnetosphere) channels these charged particles toward the polar regions (North and South Poles).
3. Atmospheric Collision: When these particles collide with gas molecules (e.g., oxygen, nitrogen) in the upper atmosphere (ionosphere/thermosphere), the gases become excited.
4. Photon Release: As the excited gas molecules return to their normal energy state, they release energy as photons (light), creating the colorful auroral displays.

Question 27: Filling the Blanks

The first blank refers to the magnetic field (created by the spinning of Earth’s liquid iron core). The second blank refers to the ozone layer (which absorbs harmful ultraviolet (UV) solar radiation, protecting Earth from excessive UV exposure).

Earth’s Motions: Sketching Seasons

To sketch Earth’s axial position and tilt relative to the Sun for seasons:

1. Axial Tilt: Earth’s axis is tilted at ~23.5° relative to its orbital plane (ecliptic).
2. Seasonal Positions:

• Summer (Northern Hemisphere): Earth’s North Pole tilts toward the Sun → longer days, more direct sunlight.
• Winter (Northern Hemisphere): Earth’s North Pole tilts away from the Sun → shorter days, less direct sunlight.
• Spring/Fall (Equinoxes): Earth’s axis is neither tilted toward nor away from the Sun → nearly equal day/night globally.
• Label each position with the season and draw the axis tilt (dashed line) for clarity.

Stars: Defining Theories

1. Big Bang Theory: A scientific model describing the origin of the universe. It proposes the universe began as an extremely hot, dense singularity ~13.8 billion years ago and has been expanding and cooling ever since (supported by cosmic microwave background radiation, redshift of galaxies, etc.).
2. Nebular Theory: Explains the formation of the solar system. It states that the Sun and planets formed from a rotating cloud of gas and dust (a nebula) that collapsed under gravity. Over time, the nebula flattened into a disk, with the Sun forming at the center and planets accreting from the disk’s material.

Final Answers (Key Fill-Ins/Definitions)

• Q26: Auroras are caused by solar wind particles interacting with Earth’s magnetic field and atmospheric gases.
• Q27: The magnetic field is created by Earth’s core spinning; the ozone layer protects from harmful solar radiation.
• Earth’s Seasons: Tilt (23.5°) and orbital position determine seasons (toward/away from Sun for summer/winter, equinoxes for spring/fall).
• Big Bang Theory: Universe originated from a hot, dense singularity ~13.8 billion years ago.
• Nebular Theory: Solar system formed from a collapsing gas/dust nebula.