Universe

Front

What is redshift?

Back

Redshift is the phenomenon where light from an object moving away from an observer shifts to longer wavelengths, indicating that the object is receding.

Front

What does the Big Bang Theory explain?

Back

The Big Bang Theory explains how our universe began, suggesting it started from a singular point and has been expanding ever since.

Front

What is a spectrum in astronomy?

Back

A spectrum is a band of colors produced when light emitted from a star or galaxy is separated, showing the different wavelengths of light.

Front

What does it mean that the universe is expanding?

Back

The universe is expanding means that galaxies are moving away from each other, indicating that the universe is growing larger over time.

Front

What type of galaxy is characterized by spiral arms?

Back

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

Front

What is blueshift?

Back

Blueshift is the phenomenon where light from an object moving towards an observer shifts to shorter wavelengths, indicating that the object is approaching.

Front

What is the significance of the cosmic microwave background radiation?

Back

The cosmic microwave background radiation is the afterglow of the Big Bang, providing evidence for the universe's early hot and dense state.

Front

What are the three main types of galaxies?

Back

The three main types of galaxies are spiral, elliptical, and irregular.

Front

What is the role of gravity in the universe?

Back

Gravity is the force that attracts objects with mass towards each other, playing a crucial role in the formation and structure of galaxies and stars.

Front

What is a light-year?

Back

A light-year is the distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).