🔭 How do astronomers measure 📐distance in space? 🪐 ⬇️ 🧐 Here are 3️⃣ techniques that astronomers use to measure those super far-out object in space! 🌌 1. Parallax - an angle measurement between an apparent shift of a star. 2. Cosmic rulers - using an object with a known intrinsic brightness, like type 1a supernovae, astronomer can find distances to the host galaxy of that supernovae by measuring how long the light takes to reach us, since the speed of light is known at 300,000 km/s. 3. Redshift - galaxies super duper far away will begin looking redder and redder 🔴 as they move away, by measuring the degree of the shift to the red end of the spectrum, astronomers can make a measurement of just how far these galaxies are receding away from us. Here are some studies you can read to learn more about cosmic measurements!! 1. “The Astrometric Technique of Parallax” by Perryman, M. A. C. et al. (1997) - This paper discusses the astrometric method of parallax measurement and its application in determining the distances to stars using data from the Hipparcos satellite. 3. “Gaia Data Release 2: Summary of the contents and survey properties” by Gaia Collaboration et al. (2018) - This paper discusses the second data release from the Gaia space mission, which provides precise parallax measurements for over a billion stars in the Milky Way galaxy. 4. “The Use of Cepheids as Distance Indicators and the Scale of the Universe” by Freedman, Wendy L. (2010) - This paper provides an overview of the use of Cepheid variable stars as standard candles and their role in calibrating the cosmic distance scale. More papers are cited on my youtube channel for this same video!! Did you know of any of these techniques?? #space #astronomy #lightyear #parallax #supernova #redshift #galaxy #astrophysics