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  • Cosmic Distances - NASA Science
    For much greater distances — interstellar distances — astronomers use light years A light year is the distance a photon of light travels in one year, which is about 6 trillion miles (9 trillion kilometers, or 63,000 AU)
  • Understanding Light Years: How Far Is Far in Space?
    Light years simplify the math and put things into a form that better expresses how vast space truly is It also helps connect distance with time When we say a galaxy is 100 million light years away, we’re not just saying it’s far—we’re saying we’re seeing it as it was 100 million years ago
  • What Is a Light-Year? | NASA Space Place – NASA Science for Kids
    A light-year is the distance light travels in one Earth year Learn about how we use light-years to measure the distance of objects in space
  • What is a light-year? Bill Nye explains | CNN
    Science educator and engineer Bill Nye explains what a light-year is, why we have a unique measurement for outer space, and why it’s “the coolest thing ever that there’s so much we don’t
  • Light-year - Wikipedia
    Galaxies themselves span from a few thousand to a few hundred thousand light-years in diameter, and are separated from neighbouring galaxies and galaxy clusters by millions of light-years
  • Light-Year and Astronomical Units: Understanding Distance in Space
    The distances between planets, stars, and galaxies are so vast that astronomers rely on specialized units like the light-year and the astronomical unit This guide explains what these units mean, how they’re used, and why they’re essential for understanding the scale of the universe
  • Define Light-Year and Explain: The Basics of Astronomical Distance
    TL;DR: A light-year isn’t a unit of time—it’s a measure of distance equal to how far light travels in one year (~5 88 trillion miles) It helps astronomers describe vast cosmic distances, like the nearest star (Proxima Centauri, 4 24 light-years away) or galaxies millions of light-years away
  • Science test #4 Flashcards | Quizlet
    a light year is the distance it takes light to travel in a year Our universe is so big that not even AUs are big enough to describe it So, scientists use the fastest thing known in the universe, light
  • Observable universe - Wikipedia
    According to calculations, the current comoving distance to particles from which the cosmic microwave background radiation (CMBR) was emitted, which represents the radius of the visible universe, is about 14 0 billion parsecs (about 45 7 billion light-years)
  • Observable universe | Definition, Size, Description, Facts | Britannica
    That would seem to indicate that the observable universe is 13 8 billion light-years in any direction from Earth and 27 6 billion light-years in diameter However, according to Hubble’s law, space has been expanding since the big bang, and thus the observable universe continues to expand as well





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