Astronomy 1/2 way Unit Practice

Front

Which planet has an orbital period shorter than Earth?

Back

Mercury has an orbital period of about 88 Earth days, making it the planet with the shortest orbital period in the solar system.

Front

What is a massive and dense object from which not even light can escape?

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.

Front

In red shift, the wavelengths of light become:

Back

Longer. Red shift occurs when light from an object is stretched to longer wavelengths, indicating that the object is moving away from the observer.

Front

What is the term for the point where a planet is closest to the Sun?

Back

Perihelion is the point in the orbit of a planet where it is closest to the Sun.

Front

What type of galaxies have spiral arms that wind outward from the center?

Back

Spiral Galaxies are characterized by their spiral structure, with arms that extend outward from the center.

Front

What is the term for the point in a planet's orbit where it is farthest from the Sun?

Back

Aphelion is the point in the orbit of a planet where it is farthest from the Sun.

Front

What phenomenon occurs when light from distant galaxies shifts towards the red end of the spectrum?

Back

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

Front

What is the main component of the universe that is invisible and detectable only through its gravitational effects?

Back

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

Front

What is the name of the force that keeps planets in orbit around the Sun?

Back

Gravitational force is the attraction between two masses, which keeps planets in orbit around the Sun.

Front

What is the term for a star that suddenly increases in brightness due to a catastrophic explosion?

Back

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