The Universe Review

Front

What is a space probe?

Back

A space probe is a robotic spacecraft that travels to other worlds to collect data and objects to send back to Earth.

Front

What is the function of a spectroscope?

Back

A spectroscope is an instrument used to collect light and diffract it into spectra to determine various data about celestial objects.

Front

What two factors affect gravity?

Back

Gravity is affected by mass and distance.

Front

What happens to wavelength and frequency during redshift?

Back

During redshift, the wavelength increases and the frequency decreases.

Front

What did Edwin Hubble discover about galaxies?

Back

Edwin Hubble discovered that galaxies are mostly moving away from us.

Front

Define '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

What is the Big Bang Theory?

Back

The Big Bang Theory is the leading explanation for the origin of the universe, stating that it began as a singularity approximately 13.8 billion years ago and has been expanding ever since.

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).

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 that generates energy through nuclear fusion.

Front

What is dark matter?

Back

Dark matter is a form of matter that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects.