Components of the Universe

Front

What is a white dwarf star?

Back

A white dwarf star is a small, dense star that is typically the size of Earth but has a mass similar to that of the Sun. They are the remnants of stars that have exhausted their nuclear fuel and are characterized by dim luminosity.

Front

What does the Hertzsprung-Russell Diagram illustrate?

Back

The Hertzsprung-Russell Diagram is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

Which star has the lowest temperature: A, B, C, or D?

Back

C has the lowest temperature.

Front

Which star is the hottest: Red Star, Yellow Star, Orange Star, or Blue Star?

Back

The Blue Star is the hottest.

Front

What type of galaxy is characterized by a spiral shape?

Back

A Spiral galaxy is characterized by its spiral structure, with arms that extend outward from the center.

Front

List four components of the universe in order from smallest to largest.

Back

Planets, Stars, Nebulae, Galaxies.

Front

What is a galaxy?

Back

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

Front

Define nebula.

Back

A nebula is a giant cloud of dust and gas in space, often the birthplace of stars.

Front

What is the difference between a star and a planet?

Back

A star is a luminous celestial body made of plasma that generates energy through nuclear fusion, while a planet is a celestial body that orbits a star and does not produce its own light.

Front

What is the significance of the color of a star?

Back

The color of a star indicates its temperature; blue stars are the hottest, followed by white, yellow, orange, and red stars, which are the coolest.