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Gravity decreases with altitude as one rises above the Earth's surface because greater altitude means greater distance from the Earth's centre. All other things being equal, an increase in altitude from sea level to 9,000 metres (30,000 ft) causes a weight decrease of about 0.29%.
The age of Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). [1] [2] [3] [4] This age may represent the age of Earth 's accretion, or ...
These lists contain the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids ), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects .
A potentially habitable exoplanet that is roughly similar in size to Earth has been found in a system located 40 light-years away, according to a new study.
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 altitudes of the mid-day sun at two places a known north–south distance apart. [2] He achieved a great degree of precision in his computation. [3] Treating the Earth as a sphere, its circumference would be its ...
Earth's early atmosphere consisted of accreted gases from the solar nebula, but the atmosphere changed significantly over time, affected by many factors such as volcanism, impact events, weathering and the evolution of life (particularly the photoautotrophs ).
Earth radius (denoted as R🜨 or RE) 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 (an oblate ellipsoid ), the radius ranges from a maximum ( equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum ( polar radius, denoted b) of nearly 6,357 km (3,950 mi).
List of star systems within 45–50 light-years. This is a list of star systems within 45-50 light years of Earth . Star system. Median distance ( ly ) Stars in system. Spectral type. Apparent magnitude (V) Comments and references. WISE 0323-6025.