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 subfield of astronomy that specifically applies the principles of physics and chemistry to understand 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 rate of its expansion, the existence of dark matter and dark energy, and the formation of stars and galaxies.
Explain the concept of a 'light-year' in astronomy.
A light-year is a unit of astronomical distance, representing the distance that light travels in one Earth 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 Hubble, study the formation of the first stars and galaxies, investigate the evolution of galaxies, and characterize exoplanets and their atmospheres.
What is a 'redshift' and how is it used in astronomy?
Redshift is the phenomenon where electromagnetic radiation from an object undergoes an increase in wavelength. In astronomy, it is observed in the light from distant galaxies, indicating that they are moving away from us due to the expansion of the universe. The greater the redshift, the farther away the galaxy and the faster it is receding.
Describe the significance of the Voyager program in space exploration.
The Voyager program, consisting of Voyager 1 and Voyager 2, has conducted extensive flybys of the outer planets (Jupiter, Saturn, Uranus, and Neptune), providing groundbreaking data and images. Both spacecraft are now in interstellar space, making them the most distant human-made objects and continuing to send back data about the heliosphere and beyond.