הצלה קהל אקלים electromagnetic spectrum telescopes נניח השערה חג ההודיה
Light and telescopes — Science Learning Hub
ESA Webb Telescope on Twitter: "1/ #BFFinSpace 🤜🤛 @hubbleESA has a 2.4m primary mirror and performs observations at ultraviolet, optical & near-infrared wavelengths. Webb's primary mirror is 6.5m in diameter and will