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Astro. Chpt. 1
From Solar System to Galaxy to Universe
| Question | Answer |
|---|---|
| There is a beginning to the universe, but is there an edge or an end? | No, there is no edge or end to the universe. |
| What is "field of view"? | Area that is visible. |
| If you learn how to use them, what do x-rays and radiowaves do for us? | X-rays and radiowaves can reveal things not visible to the naked eye. |
| Are mountains and valleys permanent landmarks or temporary? | Mountains and valleys are only temporary features on Earth as they are constantly changing. |
| How often does Earth make a complete rotation on it's axis? | Earth makes one complete rotation on it's axis every 24 hours. |
| In what direction does Earth rotate? | Earth rotates Eastward on it's axis. |
| How does the moon's size compare to the Earth's? | The moon's diameter is about 1/4 the length of the Earth. |
| What is the distance from Earth to it's moon in miles? | The distance from Earth to the moon is about 240,000 miles, 380,000 kilometers. |
| What is scientific notation? | Scientific notation is a shorter way to write out very large numbers with a lot of zeros and very small numbers with a lot of numbers to the right of the decimal place. |
| In scientific notation, how would you write 380,000? | 3.8 x 10^5 |
| What does the solar system consist of? (Hint: there are five) | The solar system consists of the sun, it's family of planets, and some small bodies including moons, asteroids, and comets. |
| What are planets? | Planets are small, non-luminous bodies that shine by reflecting the sun's light. |
| Earth is about the same size as what planet in our solar system? | Earth is about the same size as Venus. |
| How does the size of Mercury compare to the size of the Earth's moon? | Mercury is a little larger than Earth's moon. |
| What are stars? | Stars are luminous balls of gas that generate their own energy. |
| How does the size of the sun compare to the size of the Earth? | The sun is about 110 times larger in diameter than the Earth. |
| How long does it take for Earth to orbit the sun? | It takes one year for Earth to make one complete orbit around the sun. |
| How long is one AU? | One AU is the distance from the Earth to the sun. |
| In miles, how far is the Earth from the sun? | The Earth is about 93 million miles from the sun. |
| Do the major planets have perfectly circular orbits? | No, the major planets have slightly elliptical orbits. |
| How long does it take light from the sun to reach Earth? | It takes about 8 minutes for light from the sun to reach Earth. |
| Is Pluto still considered a major planet? | No, Pluto is no longer considered a major planet. |
| How long is one light year (ly)? | One light year is the distance that light travels in one year. |
| What is the nearest star to the sun? | The closest star to the sun is Proxima Centauri. |
| In astronomical diagrams, what does the size of stars represent? | The sizes of the dots represent not the sizes of the stars, but their brightness. |
| What fills the spaces in-between stars? | A thin gas fills the space between stars. |
| What does the thin gas between stars give birth to? | The thing gas gives birth to new stars. |
| How long ago did our sun form? | The sun formed about 5 billion years ago. |
| In our galaxy, where is the sun located? | Our sun is located 2/3 of the way from the center of the Milky Way galaxy. |
| Galaxies are commonly grouped into what? | Galaxies are commonly grouped into "clusters". |
| What are clusters of galaxies grouped into? | Clusters of galaxies are grouped into "superclusters". |
| Superclusters of galaxies are linked to form what? | Superclusters are linked together to form long filaments and walls. |
| What are the largest known structures in the universe? | The largest known structures in the universe are the filaments and walls created by links of superclusters. |
| How many light years is the Milky Way Galaxy in diameter? | Our galaxy is about 80,000 ly in diameter. |
| Why are planets around other stars difficult to detect? | Planets around other stars are difficult to spot because they reflect too little light to be visible so near to the brilliance of a star. |
| On a photograph of the planet Earth, how can you tell the sunset line from the sunrise line? | You can tell which side of the Earth is the sunset line because it will be blurred along the edge. |
| What is the outermost planet in our solar system? | Neptune is the outermost major planet in our solar system. |
| What is the difference between the Milky Way and the Milky Way Galaxy? | The Milky Way is a band of stars visible around the Earth, the Milky Way Galaxy is the galaxy in which we reside. |
Created by:
rebecca_forcier
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