Scientists once saw a mysterious blue blob hurtling toward the earth at 250,000 mph. How did that blob, combined with the concept of "redshift," reveal the biggest secrets of the universe? ––via What The Physics | NOVA l PBS

'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer. #xuhuong #fyp #universe #space #astronomical #astronomy #science #distances #astrophysics #physics #knowledge #earth #reelsfb #gravity #reelsinstagram #reels2023 #reelsforyou | The World of Planets