components of the universe

A large cloud of gas and dust in interstellar space; the predecessor to stars...

• Constellation
• Black hole
• Nebula
• Galaxy

All stars start as gas and dust in a(n)

• nebula
• black hole
• red giant
• black dwarf

A system of stars, gas, dust, and dark matter bound together by gravity is called -

• an asteroid

• a moon

• a galaxy

• a nebula

Which of the following is an accurate description of the relationship between components of the universe?

• Stars always contain galaxies.

• Galaxies contain many stars.

• Stars contain several nebulae.

• Nebulae contain many galaxies.

The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?

• Planets, stars, nebulae, galaxies

• Planets, stars, galaxies, nebulae

• Nebulae, stars, planets, galaxies

• Galaxies, stars, planets, nebulae

A student makes a model of the sun-Earth system by swinging a ball around her head. Using this model, the student is trying to explain how Earth stays on a path around the sun.

The student explains that this path is the result of -

• the magnetic attraction between Earth and the sun

• potential energy stored in Earth that originated in the sun

• the gravitational attraction between the sun and Earth

• electromagnetic energy from the sun pulling on Earth

Stars are made mostly of which two elements?

• hydrogen and helium

• mercury and strontium

• iron and potassium

• krypton and bismuth

Galaxies are classified by their shapes into all of the following types EXCEPT -

• spiral galaxy

• irregular galaxy

• oblong galaxy

• elliptical galaxy

What spiral galaxy do we live in?

• Andromeda Galaxy

• Dwarf Galaxy Saggitarius

• Milky Way Galaxy

• Snickers Galaxy

Scientists believe nearly __________ stars lie in our galaxy, and just as many planets.

• 20 billion stars

• 200 milion stars

• 200 billion stars