Questions and Answers
What is a black hole?
A galaxy is primarily composed of stars and has no dark matter.
False
What is a light-year?
The distance that light travels in one year, approximately 9.46 trillion kilometers.
____________ is the ability to gain an accurate and deep understanding of a situation by thinking about it.
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Match the term with its definition:
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Which of the following best describes an observatory?
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Giant galaxies like the Milky Way contain fewer than 100 billion stars.
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How high is low-Earth orbit typically?
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What type of radiation is analogous to gamma rays?
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The universe has been contracting since its formation during the Big Bang.
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What is a telescope primarily used for?
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Stars emit light and other forms of __________ radiation when they become hot enough.
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Match the terms with their definitions:
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What event is known for the formation of the universe approximately 13.8 billion years ago?
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Study Notes
Key Concepts in Astronomy
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Black Hole
- A space region with a gravitational field so strong that no form of matter or radiation can escape.
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Colleague
- Refers to a person who collaborates or works alongside another; often used in a workforce context.
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Cosmic
- Describes anything related to the universe and its vast entities.
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Galaxy
- A massive gravitationally bound system consisting of stars, gas, dust, and dark matter.
- Examples include the Milky Way, which contains over 100 billion stars, while smaller galaxies may contain just a few thousand stars.
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Insight
- The capacity to deeply understand situations by reflective thinking, as opposed to through trial and experimentation.
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Light-Year
- The distance light travels in a year, approximately 9.46 trillion kilometers or about 6 trillion miles.
- A light-year can be visualized with a rope wrapping around Earth 40,000 km long, repeated 236 million times.
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Low-Earth Orbit
- Refers to orbits close to Earth's surface, typically below 1,000 kilometers (620 miles) in altitude.
- Commercial aircraft fly much lower, at altitudes around 14 km.
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Matter
- Defined as any substance that occupies space and possesses mass, with a property of weight on Earth's surface.
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Observatory
- A structure designed to house telescopes and related instruments for astronomical observations.
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Star
- Fundamental components of galaxies, stars form when gravity condenses gas clouds.
- They emit light and other electromagnetic radiation; the sun is the nearest star to Earth.
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Telescope
- An optical instrument that gathers and magnifies distant objects.
- Some telescopes collect radio emissions instead of visible light.
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Transient
- Describes phenomena or events that occur for a brief time.
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Transition
- The process or area where one state or condition changes into another, which can occur abruptly or gradually.
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Universe
- The entirety of existence, encompassing all matter, energy, galaxies, and time, believed to have originated from the Big Bang approximately 13.8 billion years ago.
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X-ray
- A form of high-energy radiation, similar to gamma rays but with slightly lower energy levels.
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Description
Test your knowledge on key terms related to the cosmos and outer space! This quiz includes definitions of words like black hole, galaxy, and cosmic, helping you explore the wonders of the universe. Challenge yourself and see how well you understand these astronomical concepts.
