Universe

Front

What is the measure of a star's brightness called?

Back

Luminosity is the measure of a star's brightness, representing the total amount of energy emitted by the star per unit time.

Front

Which property of a star determines its color?

Back

Temperature determines a star's color; hotter stars appear blue, while cooler stars appear red.

Front

What category contains the most stars?

Back

The Main Sequence is the category that contains the most stars, where stars spend the majority of their lifetimes.

Front

What type of galaxy has no defined pattern or shape?

Back

An Irregular galaxy has no defined pattern or shape, often appearing chaotic in structure.

Front

What color is the hottest star?

Back

The hottest stars are blue, indicating high temperatures.

Front

What is the term for the visible light emitted by stars?

Back

Starlight refers to the visible light emitted by stars, which can be observed from Earth.

Front

What is the primary force that holds galaxies together?

Back

Gravity is the primary force that holds galaxies together, influencing the motion of stars and other celestial bodies.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion of a star, marking the end of its life cycle.

Front

What is the difference between a spiral and elliptical galaxy?

Back

Spiral galaxies have a flat, rotating disk with arms, while elliptical galaxies are more rounded and lack distinct structures.

Front

What is a black hole?

Back

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it.