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The orbital speed of Earth averages about 29.78 km/s (107,200 km/h; 66,600 mph), which is fast enough to travel a distance equal to Earth's diameter, about 12,742 km (7,918 mi), in seven minutes, and the distance from Earth to the Moon, 384,400 km (238,900 mi), in about 3.5 hours.
A remarkably cloud-free Africa is at upper left, stretching down to the center of the image. Saudi Arabia is visible at the top of the disk and Antarctica and the south pole are at the bottom. Asia is on the horizon is at upper right. The Earth is 12,740 km (7,920 mi) in diameter. (Apollo 17, AS17-148-22727)
2024 YR 4 is an asteroid estimated to be 40 to 90 metres (130 to 300 ft) in diameter that is classified as an Apollo-type (Earth-crossing) near-Earth object.It was discovered by the Chilean station of the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 27 December 2024.
Earth's oceans are thought to have been the birthplace for life on our planet. ... whose diameter of roughly 1,940 miles (3,100 km) is approximately 90% that of our moon, has been viewed as a ...
Asteroid 2024 YR4 has a 2% chance of hitting Earth in 2032. Astronomers are tracking it to refine estimates of its size and orbit to see how much of a risk the space rock poses.
Al-Farghānī (Latinized as Alfraganus) was a Persian astronomer of the 9th century involved in measuring the diameter of Earth, and commissioned by Al-Ma'mun. His estimate given above for a degree (56 2 ⁄ 3 Arabic miles) was much more accurate than the 60 2 ⁄ 3 Roman miles (89.7 km) given by Ptolemy.
Diameter Notes Sources (most suitable unit) (km, with scientific notation) Earth: 12,756.2 km (equatorial) 1.28×10 4: Measurement comprises just the solid part of the Earth; there is no agreed upper boundary for Earth's atmosphere. The geocorona, a layer of UV-luminescent hydrogen atoms, lies at 100,000 km.
Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [1] Treating the Earth as a sphere, its circumference would be its single most important measurement. [2]