Astronomy

“Astronomy” is a fascinating subject that can benefit you, an ESL learner, in many ways. By learning about astronomical discoveries, you practice comprehension skills and learn to follow complex ideas. Today’s vocabulary is sure to not only spark curiosity about the world around you but give you the confidence needed to ask questions and participate in “astronomy” related discussions in English.

In today’s lesson, you’re going to have:

• 5 advanced English vocabulary words about Astronomy.

• 15 examples of phrases that you can use on a daily basis.

• Eye-catching images will help you learn and retain the vocabulary.

1. Galaxy

📚 DEFINITION

A massive system of stars, stellar remnants, interstellar gas, dust, dark matter, and other celestial objects bound together by gravitational forces.

📄 Example Sentences:

1. The Milky Way is the galaxy that contains our solar system.

2. Astronomers study distant galaxies to better understand the structure and evolution of the universe.

3. The Hubble Space Telescope has captured breathtaking images of galaxies millions of light-years away.

2. Constellation

📚 DEFINITION

A group of stars that form a recognizable pattern or shape in the night sky, often named after mythological characters, animals, or objects.

📄 Example Sentences:

1. Orion is one of the most prominent constellations visible in the winter sky.

2. Ancient civilizations used constellations as celestial maps for navigation and storytelling.

3. The Big Dipper is a well-known constellation consisting of seven bright stars.

3. Comet

📚 DEFINITION

A small celestial body composed of ice, dust, and rock that orbits the Sun in an elongated, eccentric orbit, typically developing a bright coma and tail when near the Sun.

📄 Example Sentences:

1. Halley's Comet is one of the most famous periodic comets, visible from Earth approximately every 75-76 years.

2. Comets are thought to be remnants from the early solar system and may contain clues about its formation.

3. The Rosetta mission successfully landed a probe on Comet 67P/Churyumov–Gerasimenko to study its composition and structure.

4. Orbit

📚 DEFINITION

The curved path that an object, such as a planet or satellite, follows as it revolves around another object due to gravitational attraction; to move in such a path.

📄 Example Sentences:

1. Earth orbits the Sun once every 365.25 days, creating the cycle of seasons.

2. Satellites are placed into specific orbits around Earth to serve various purposes, such as communication, weather monitoring, and navigation.

3. The International Space Station orbits the Earth at an altitude of approximately 400 kilometers.

5. Telescope

📚 DEFINITION

An optical instrument that gathers and magnifies light to observe distant objects in the sky, such as stars, planets, and galaxies.

📄 Example Sentences:

1. Galileo Galilei revolutionized astronomy with his observations made using a telescope in the 17th century.

2. Modern telescopes come in various designs, including refracting, reflecting, and compound telescopes, each suited for different purposes.

3. Amateur astronomers use telescopes to explore the night sky and discover celestial wonders.

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