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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] Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific measurement and calculation was done by Eratosthenes, by comparing ...
Currently most of the objects of mass between 10 9 kg to 10 12 kg (less than 1000 teragrams (Tg)) listed here are near-Earth asteroids (NEAs). The Aten asteroid 1994 WR12 has less mass than the Great Pyramid of Giza, 5.9 Ć 10 9 kg. For more about very small objects in the Solar System, see meteoroid, micrometeoroid, cosmic dust, and ...
Orion Arm ā a spiral arm of the Milky Way. Solar System ā the Sun and the objects that orbit it, including eight planets, the third planet closest to the Sun being Earth. Earth's orbit ā path through which the Earth travels around the Sun. The average distance between the Earth and the Sun is 149.60 million kilometers (92.96 million miles).
e. Earth radius (denoted as RšØ or ) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid, the radius ranges from a maximum of nearly 6,378 km (3,963 mi) ( equatorial radius, denoted a) to a minimum of nearly 6,357 km (3,950 mi) ( polar radius, denoted b ).
To put this in perspective, the full Moon as viewed from Earth is about 1 ā 2 Ā°, or 30 ā² (or 1800ā³). The Moon's motion across the sky can be measured in angular size: approximately 15Ā° every hour, or 15ā³ per second. A one-mile-long line painted on the face of the Moon would appear from Earth to be about 1ā³ in length.
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
For example, an Earth-like planet at 1.25 AU from Ī± Cen A (with a revolution period of 1.34 years) would get Sun-like illumination from its primary, and Ī± Cen B would appear 5.7ā8.6 magnitudes dimmer (ā21.0 to ā18.2), 190ā2,700 times dimmer than Ī± Cen A but still 150ā2,100 times brighter than the full Moon.
Earth's crust. Earth's crust is its thick outer shell of rock, referring to less than one percent of the planet's radius and volume. It is the top component of the lithosphere, a division of Earth's layers that includes the crust and the upper part of the mantle. [1] The lithosphere is broken into tectonic plates whose motion allows heat to ...