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    • Image courtesy of slideserve.com

      slideserve.com

      • The answer is simply light. The term “light-year” shows up a lot in astronomy. This is a measure of distance that means exactly what it says – the distance that light travels in one year. Given that the speed of light is 186,000 miles (299,000 kilometers) per second, light can cover some serious ground over the course of 365 days.
      science.nasa.gov/mission/hubble/science/science-behind-the-discoveries/time-travel-observing-cosmic-history/

      Time Travel: Observing Cosmic History - NASA Science

  2. www.sciencing.com › light-travel-4570255How Does Light Travel? - Sciencing

    Apr 24, 2017 · Light always takes the shortest path between a source and destination. A line drawn from the source to the destination, perpendicular to the wave-fronts, is called a ray. Far from the source, spherical wave fronts degenerate into a series of parallel lines moving in the direction of the ray.

  3. www.bbc.co.uk › bitesize › articlesLight Waves - BBC Bitesize

    What are light waves? Light is a type of electromagnetic radiation that can be detected by the eye. It travels as a transverse wave. Unlike a sound waves, light waves do not need a medium to...

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  5. van.physics.illinois.edu › ask › listingDoes Light Travel Forever? | Physics Van | Illinois

    • How far does light go? how long does light go. - Jason (age 11) A: Hi Jason, Light just keeps going and going until it bumps into something.
    • less than one photon? Can light intensity reduce to a level where it's energy is less than 1 photon (probably after travelling an almost infinite distance from a point source)?
    • stars too far away to see? does there is any star that we can can't get it's light because of itis farness?...... sorry with having any problems in my English gramer, my English language is not good enough.
    • light going out to space. If we are reflections of light, does that reflection make it out into space and keeps traveling til its asorbed.

  6. www.livescience.com › physics-mathematics › particleIs light a particle or a wave? - Live Science

    14 hours ago · According to Sapienza, this isn't the right question to be asking. "Light is not sometimes a particle and sometimes a wave," he said. "It is always both a wave and a particle. It's just that we ...

  7. www.teachastronomy.com › Light-Travel-TimeLight Travel Time - Teach Astronomy

    The 5 hours it takes light to travel across our Solar System may seem like a short period to cross such a large distance, but we have to think about scale. While distances within the Solar System are large to us, they are dwarfed by the distances between the stars.

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  8. www.universetoday.com › 83832How Does Light Travel? - Universe Today

    May 19, 2016 · Technically speaking, radio waves are emitted at various frequencies that share the same space time as light. They are not however light. They’re modulated electrons.

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  10. science.nasa.gov › mission › hubbleTime Travel: Observing Cosmic History - NASA Science

    By observing light from faraway cosmic objects, the Hubble Space Telescope is like a time machine. Light takes time to reach Hubble, because it travels great distances. That means images captured by Hubble today, show what the objects looked like years ago!