Science Studyguides

Science Studyguide

Chapter 12

Astronomers can use refracting and reflecting telescopes to study the colors of a star's light.
The word used to name everything that exists in space is the universe.
Astronomers use refracting telescopes to gather light with a lens.
Astronomers use satellites to study the universe above the problems of the atmosphere.
Astronomers avoid the twinkling of the Earth's atmosphere by using satellites.
An automated spacecraft that does not orbit objects is a space probe.
Space probes help astronomers study objects the probes pass in space by taking and sending pictures.
The average distance between the Earth and sun is used as a measurement called an astronomical unit.
Astronomical units are used by astronomers to help calculate the distances inside our solar system.
Scientists call the distance light travels in one year a light year.
Light years are used mostly to measure distances outside our solar system.
A constellation is a group of stars.
The stars in most constellations are far apart.
Long ago, people used constellations to help them know when to plant crops.
Stories or fables about people, animals, and objects led ancient people to give names to the constellations.
The sun, Earth, and the other planets are part of the Milky Way.
The Milky Way is a group of stars, dust, and gases.
Gravity holds together a group of stars, gases, and dust in a galaxy.
A star's magnitude depends on how far from the Earth the star is.
A star's magnitude is partly determined by how much light it gives off.
The brightness of a star is mainly determined by its temperature.
The color of a star is determined by its temperature.
The energy that makes a star glow comes from inside the star.

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