galaxy that does not have a regular shape

all of space and everything in it

a theory that proposes that the universe formed in an instant in an enormous explosion

a phenomenon in which the wavelengths of light from a source shifts to the red end of the spectrum

the tendency of sound from a moving object to change frequency to a stationary observer

a well-tested explanation of an aspect of the natural world

Characteristics of Stars

Stars are massive, luminous spheres of hot gas, primarily composed of hydrogen and helium. They produce energy through nuclear fusion, combining lighter atoms into heavier ones, which releases energy that makes stars shine. Stars generate essential elements like carbon, oxygen, nitrogen, and iron, which are crucial for life and non-living matter.

Stars begin as nebulae, large clouds of gas and dust. Gravity pulls the material together to form a protostar.

When nuclear fusion starts, the protostar becomes a star. The star's mass determines its lifespan.

End Stages of Sun-like Stars

Become red giants as they run out of fuel. Eject outer layers to form a planetary nebula, leaving behind a white dwarf.

End Stages of Massive Stars

Become red supergiants as they exhaust their fuel. Undergo a supernova explosion and either form a neutron star or a black hole, depending on their mass.

Classification of Stars by Color and Temperature

Red stars are the coolest. Yellow stars (e.g., the Sun) have moderate temperatures. Blue stars are the hottest.

Classification of Stars by Brightness (Luminosity)

Depends on a star’s mass and temperature. Hotter and more massive stars are more luminous.

Classification of Stars by Size

Stars can vary from small white dwarfs to massive giants and supergiants.

Giants and Supergiants

Luminous and massive, located at the top of the H-R Diagram.

Hot but not very luminous, located at the bottom-left of the H-R Diagram.

Units and Measurements: Light-Year

The distance light travels in one year (~9.46 trillion kilometers).

Units and Measurements: Kelvin (K)

Temperature scale used for stars.

Important Examples: Our Sun

A yellow main-sequence star. Moderate in temperature and luminosity.

Important Examples: Betelgeuse

A red supergiant. Cooler and more luminous than the Sun.

Visuals to Study: H-R Diagram

Displays the classification of stars by luminosity, temperature, and size.

Tips for Remembering: Star Color

Think of star color as a temperature indicator: blue = hot, red = cool.

Tips for Remembering: Star Size and Lifespan

The larger the star, the shorter its lifespan due to faster fuel consumption.

Galaxies are massive systems of stars, gas, dust, and other objects bound by gravity. Range in size from a few thousand stars to trillions.

Types of Galaxies: Spiral Galaxies

Features: Central bulge, spiral arms, and active star formation. (Example: The Milky Way)

Types of Galaxies: Elliptical Galaxies

Features: Round or oval shapes, little gas and dust, mostly older stars. Star Formation: Minimal due to lack of gas.

Types of Galaxies: Irregular Galaxies

Features: No defined shape, rich in gas and dust. Star Formation: Active, with many young stars.

Type: Barred spiral galaxy. Structure: Central bar of stars and gas. Major arms: Perseus and Scutum-Centaurus. Smaller arm: Orion Arm (solar system location). Size: Over 150,000 light-years in diameter.

Star Formation in Galaxies

Dependent on the presence of gas and dust. Spiral and irregular galaxies have higher star formation due to abundant gas and dust. Elliptical galaxies have low star formation rates.

Observing Galaxies: Hubble Deep Field

Shows billions of galaxies in deep space. Examples of nearby and far galaxies: Nearest: Canis Major Dwarf Galaxy (~25,000 light-years). Farthest detected: HD1 (~13.5 billion light-years).

Key Terms: Light-Year

Distance light travels in one year (~9.46 trillion km).

Key Terms: Barred Spiral Galaxy

A spiral galaxy with a central bar structure.

Key Facts about the Milky Way

The Milky Way contains 200–400 billion stars. Our solar system is ~26,000 light-years from the Milky Way's center.

Quick Comparison of Galaxy Types

Type: Shape: Star Formation: Example: Spiral: Pinwheel: High: Milky Way. Elliptical: Round/oval: Low: M87. Irregular: Undefined: High: Large Magellanic Cloud.

the force of attraction between two objects, a universal force first studied by Isaac Newton. It governs motion on Earth and in space, including the orbits of celestial bodies.

Factors Influencing Gravity: Mass

Greater mass results in a stronger gravitational force. Directly proportional to the gravitational pull.

Factors Influencing Gravity: Distance

As the distance between two objects increases, gravitational force decreases. Inversely proportional to the square of the distance.

Mass vs. Weight: Mass

Constant; measures the amount of matter in an object. Does not change based on location.

Mass vs. Weight: Weight

Variable; the force of gravity acting on an object’s mass. Changes with the strength of gravitational force at different locations (e.g., Earth vs. Moon).

Example of Mass vs. Weight

An astronaut’s weight on the Moon is much less than on Earth due to the Moon’s lower gravity.

Gravity and Orbital Motion: Inertia

An object in motion will stay in motion unless acted upon by a force.

Gravity and Orbital Motion: Combined Effect

Gravity pulls objects toward each other. Inertia ensures objects keep moving forward. Together, they maintain orbits (e.g., Moon around Earth).

Key Observations and Applications: Astronaut Training

Conducted underwater to simulate low-gravity conditions.

Components of the Universe Flashcards

Student preview

59 questions

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1.

FLASHCARD QUESTION

Front

star

Back

a giant ball of hot gas, made mostly of hydrogen and helium

2.

FLASHCARD QUESTION

Front

light-year

Back

the distance that light travels in one year, about 9.46 trillion kilometers

3.

FLASHCARD QUESTION

Front

luminosity

Back

the amount of energy a star gives off from its surface (brightness)

4.

FLASHCARD QUESTION

Front

Hertzsprung-Russell (HR) diagram

Back

a graph plotting star luminosity and temperature

5.

FLASHCARD QUESTION

Front

galaxy

Back

huge group of stars, dust, gas, planets, and other objects bound together by gravity

6.

FLASHCARD QUESTION

Front

spiral galaxy

Back

galaxy that appears to have a bulge in the center and arms that spiral outward in a pinwheel pattern

7.

FLASHCARD QUESTION

Front

elliptical galaxy

Back

galaxy shaped like a round or flattened ball

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