Characteristics of the Universe Review 2021

Front

What is the classification of the Sun?

Back

The Sun is classified as a main sequence, medium-sized star.

Front

Why does light from the Sun take about eight minutes to reach Earth?

Back

Because the Sun is the closest star to Earth.

Front

What is the relationship between a galaxy and a star in terms of mass?

Back

A galaxy has more mass than a star but less mass than the universe.

Front

What spectral class does Barnard's Star belong to?

Back

Barnard's Star belongs to spectral class M.

Front

What force causes Venus to travel along a curved path around the Sun?

Back

Gravitational attraction between the Sun and Venus.

Front

What is a galaxy?

Back

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

Front

What is a nebula?

Back

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

Front

What is the speed of light?

Back

The speed of light in a vacuum is approximately 299,792 kilometers per second (186,282 miles per second).

Front

What is the difference between a planet and a star?

Back

A planet is a celestial body that orbits a star and does not produce its own light, while a star is a massive, luminous sphere of plasma held together by gravity.

Front

What is gravitational attraction?

Back

Gravitational attraction is the force that pulls two masses toward each other, proportional to their masses and inversely proportional to the square of the distance between them.