Question

1. an astronomer describes an astronomical body as a collection of billions of stars, planets, and clouds of gas and dust, all bound together by gravity. what astronomical body is the astronomer most likely describing?

a. galaxy
b. nebula
c. universe
d. solar system

1. which of the following options describes the hierarchical relationship between astronomical bodies?

a. a star is part of a planet, which is part of a galaxy.
b. a galaxy is part of a universe, which is part of a solar system.
c. a solar system is part of a galaxy, which is part of the universe.
d. a nebula is part of a solar system, which is part of the universe.

1. which statement about distances in space correctly uses a unit of measurement?

a. a light - year is a unit of time equal to 365 days.
b. a light - year is the distance light travels in one year.
c. a light - year is larger than the distance between two galaxies.
d. a light - year is the best measurement for the distance from earth to the sun.

1. which of the following describes the relationship between a galaxy and the universe?

a. billions of galaxies make up one universe
b. millions of galaxies make up one universe
c. hundreds of galaxies make up one universe
d. thousands of galaxies make up one universe

Explanation:

1. Las galaxias son conjuntos de billones de estrellas, planetas y nubes de gas y polvo unidos por gravedad.
2. Un sistema solar es parte de una galaxia, y una galaxia es parte del universo.
3. Un año - luz es la distancia que recorre la luz en un año.
4. El universo está formado por billones de galaxias.

Answer:

1. A. galaxia
2. C. A solar system is part of a galaxy, which is part of the universe.
3. B. A light - year is the distance light travels in one year.
4. A. billions of galaxies make up one universe