Unit 1 Module G The Universe Ms. Hager

A large celestial body that is composed of gas and that emits light; the sun is this.

Stars are composed mostly of these 2 elements:

It would take a spacecraft ___________ years to reach the nearest star.

In our "solar walk", Earth was a ....

The sun is a _____________________ sized star.

A light-year is the distance that light travels in 1 year, about _______ .

The place where stars form.

The sun equals __________ solar radii.

These are made up of ten or more clusters of galaxies.

Positioned in or relating to the sky, or outer space as observed in astronomy.

These are composed of millions to billions of stars, gas, and dust held together by gravity.

This is where most stars spend most of their lives.

The actual brightness of a star.

The size of stars is expressed as ______________.

True/ False Pluto is no longer considered a planet.

The fastest interplanetary space craft can travel at about ___________km/hour.

A system of two stars orbiting one another.

The name of this unit is

Space and all the matter and energy in it.

The terrestrial planets are:

A ___ is any of the primary bodies that orbit the sun or similar body that orbits another star.

True/False On the magnitude scale, brighter stars have negative numbers & dimmer stars + #s.

These contain as many as several thousand galaxies.

On the H-R diagram, stars are plotted by their

When helium fusion in a high-mass star ends, the fusion of heavier elements begins and

When fusion in a star stops, the outer layers of the giant are ejected into space and

The distance from the Milky Way galaxy to Andromeda galaxy is approximately:

When fusion in the core stops, a star reaches its...

This consists of galaxies & voids.

Stars with the highest temperatures are typically this color.

The sun has a _________________ color.

The collection of large & small bodies that orbit our central star, the sun.

Cool stars are typically __________ in color.

These keep Earth's temperature at a moderate level.

The sun's radius is approximately 695,000 km, or about __________ times Earth's radius.

This is produced by the process of nuclear fusion.

____ planets have solid, rocky crusts and dense mantles and cores, whereas gas planets don't.

The portion of the universe that is observable from Earth using our largest telescopes.

The core of a star with an extremely high mass may collapse and form a

The measure of a star's luminosity.

The sun looks bright and big to us on Earth because of....