https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:the-earth/v/why-earth-is-unique-earth 2026-04-30T07:30:36.209464894Z Why Earth is unique - Earth Why Earth is unique Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Why Earth is unique - Earth Why Earth is unique https://cdn.kastatic.org/ka-youtube-converted/urUDy2Hj07k.mp4/urUDy2Hj07k.mp4 396 Earth https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/moon-phases-and-eclipses/v/intro-to-moon-phases 2021-04-04T12:52:27Z Intro to Moon phases The Moon and the sun look roughly the same size in the sky because although the sun’s diameter is ~400 times greater than the Moon’s, the sun is ~400 times farther away from the Earth as the Moon is! The Moon goes through phases because as it rotates around the Earth, different parts of the Moon are made visible to us from the sun’s light. Sal Khan video https://cdn.kastatic.org/googleusercontent/FyL0AYnLQMdPLj023L93PeftIJrfslodYcZjsZwDF6URhc1ViTQDlkmeqnSZbcafOPF7k9_xHNCiTMt6nga7uCk Intro to Moon phases The Moon and the sun look roughly the same size in the sky because although the sun’s diameter is ~400 times greater than the Moon’s, the sun is ~400 times farther away from the Earth as the Moon is! The Moon goes through phases because as it rotates around the Earth, different parts of the Moon are made visible to us from the sun’s light. https://cdn.kastatic.org/ka-youtube-converted/ZQcf9xLABa0.mp4/ZQcf9xLABa0.mp4 334 Earth https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:space-science/x0e04e0cb682fb793:the-earth/v/phases-of-the-moon 2022-09-02T07:28:17.303436145Z Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/b33175fe-10b7-4f4f-91da-d8c1d61bb849_1280_720_base.png Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. https://cdn.kastatic.org/ka-youtube-converted/f592IgRzq2E.mp4/f592IgRzq2E.mp4 254 Earth https://www.khanacademy.org/science/grade-4-science-pakistan-national-curriculum/xd6642c7f392cd435:solar-system-and-our-earth/xd6642c7f392cd435:earth/e/understanding-the-moon-and-its-motion 2026-07-02T12:10:59.912898911Z Understanding the Moon and its Motion Understanding the Moon and its Motion Asma Rouf exercise https://www.khanacademy.org/science/grade-4-science-pakistan-national-curriculum/xd6642c7f392cd435:solar-system-and-our-earth/xd6642c7f392cd435:earth/e/apply-the-moon-and-its-motion 2026-07-02T12:10:59.912898911Z Apply: The Moon and its Motion Apply: The Moon and its Motion Asma Rouf exercise https://www.khanacademy.org/science/grade-4-science-pakistan-national-curriculum/xd6642c7f392cd435:solar-system-and-our-earth/xd6642c7f392cd435:earth/v/day-and-night-and-earths-rotation-introductory 2026-07-02T12:10:59.912898911Z Day and Night and Earth’s Rotation - Introductory Day and Night and Earth’s Rotation - Introductory Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Day and Night and Earth’s Rotation - Introductory Day and Night and Earth’s Rotation - Introductory https://cdn.kastatic.org/ka-youtube-converted/t26eKldWmvI.mp4/t26eKldWmvI.mp4 134 Earth https://www.khanacademy.org/science/grade-4-science-pakistan-national-curriculum/xd6642c7f392cd435:solar-system-and-our-earth/xd6642c7f392cd435:earth/e/earths-rotation-and-daynight-cycle 2026-07-02T12:10:59.912898911Z Earth’s Rotation and Day–Night Cycle Earth’s Rotation and Day–Night Cycle Asma Rouf exercise https://www.khanacademy.org/science/grade-4-science-pakistan-national-curriculum/xd6642c7f392cd435:solar-system-and-our-earth/xd6642c7f392cd435:earth/e/annual-rotation-of-earth-and-seasons 2026-07-02T12:10:59.912898911Z Annual Rotation of Earth and Seasons Annual Rotation of Earth and Seasons Asma Rouf exercise