Space Exploration and Astronomy
Public flashcard deck about Space Exploration and Astronomy. 8 cards.
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What is the primary difference between astronomy and astrophysics?
Astronomy is the broader study of celestial objects, space, and the physical universe as a whole. Astrophysics is a branch of astronomy that specifically applies the principles of physics and chemistry to explain the nature of celestial bodies and phenomena.
What is the significance of the Hubble Space Telescope's contribution to astronomy?
The Hubble Space Telescope has provided unprecedentedly clear images of distant galaxies, nebulae, and planets, leading to major discoveries about the age of the universe, the expansion rate, the formation of stars and galaxies, and the existence of dark energy.
Explain the concept of a 'light-year' in astronomy.
A light-year is a unit of astronomical distance, specifically the distance that light travels in one year. It is approximately 9.46 trillion kilometers (5.88 trillion miles).
What is the main goal of the James Webb Space Telescope (JWST)?
The JWST's primary goal is to observe the universe in infrared light, allowing it to see farther back in time than ever before, study the first stars and galaxies that formed after the Big Bang, and investigate the atmospheres of exoplanets for signs of life.
What is the difference between a star and a planet?
A star is a massive, luminous ball of plasma held together by its own gravity that generates energy through nuclear fusion in its core. A planet is a celestial body that orbits a star, is massive enough for its own gravity to make it round, and has cleared the neighborhood around its orbit.
What is the 'event horizon' of a black hole?
The event horizon is the boundary around a black hole beyond which nothing, not even light, can escape its gravitational pull. It's often referred to as the 'point of no return'.