Cosmology

Billions of stars in the same region of the universe are called

• solar systems

• asteroid belts

• constellations

• galaxies

According to the big bang theory, the universe began as an explosion and is still expanding. This theory is supported by observations that the stellar spectra of distant galaxies show a

• concentration in the yellow portion of the spectrum

• concentration in the green portion of the spectrum

• shift toward the blue end of the spectrum

• shift toward the red end of the spectrum

Tags

NGSS.HS-ESS1-2

In which list are celestial features correctly shown in order of increasing size?

• galaxy, solar system, universe, planet

• solar system, galaxy, planet, universe

• planet, solar system, galaxy, universe

• universe, galaxy, solar system, planet

Tags

NGSS.MS-ESS1-3

What is the name usually given to the group of objects consisting of a sun and any planets, comets, and other objects that orbit it?

• a solar system

• a universe

• a galaxy

• an ecosystem

Most astronomers agree that at the present time universe is

• contracting

• expanding

• staying the same size

• expanding and contracting regularly

Tags

NGSS.HS-ESS1-2

In a Doppler red shift, the observed wavelengths of light from distant celestial objects appear closer to the red end of the spectrum than light from similar nearby celestial objects. The explanation for the red shift is that the universe is presently

• contracting only

• expanding only

• remaining constant in size

• alternating between contracting and expanding

Tags

NGSS.HS-ESS1-2

Compared to Earth's solar system, the universe is inferred to be

• younger and larter

• younger and smaller

• older and larger

• older and smaller

Tags

NGSS.HS-ESS1-2

Which sequence lists the relative sizes from smallest to largest?

• our solar system, Milky Way Galaxy, universe

• our solar system, universe, Milky way galaxy

• Milky Way Galaxy, our solar system, universe

• Milky Way Galaxy, universe, our solar system

Tags

NGSS.MS-ESS1-3

Most scientists believe the Milky Way Galaxy is

• spherical in shape

• 4.6 billion years old

• composed of stars revolving around Earth

• one of billions of galaxies in the universe