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Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century. Initially, Earth was believed to be the center of the Universe, which consisted only of those planets visible with the naked eye and an outlying sphere of fixed stars. [1]
Geomagnetics – Study of the Earth's magnetic field; Geomicrobiology – Science of the interactions between microbiology and geology; Glaciology – Scientific study of ice and natural phenomena involving ice; Geophysics – The physics of the Earth and its environment in space, and the study of the Earth using quantitative physical methods
Illustration of the inferred size of the super-Earth CoRoT-7b (center) in comparison with Earth and Neptune. A Super-Earth or super-terran is a type of exoplanet with a mass higher than Earth's, but substantially below those of the Solar System's ice giants, Uranus and Neptune, which are 14.5 and 17 times Earth's, respectively. [1]
In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years. [19] [20] He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value.
What on Earth? is an American television program broadcast on Science Channel. It examines strange satellite imagery and speculates on what caused the strange phenomenon. The program debuted in February 2015.
Earth's rotation imaged by Deep Space Climate Observatory, showing axis tilt. Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion.
While the majority of Earth's surface is covered by oceans, those oceans make up just a small fraction of the mass of the planet. The mass of Earth's oceans is estimated to be 1.37 × 10 21 kg, which is 0.023% of the total mass of Earth, 6.0 × 10 24 kg.
Earth is a 2023 miniseries presented by Chris Packham, produced by BBC Studios with NOVA and GBH Boston for the BBC and PBS, in partnership with the Open University. It consists of five one-hour episodes.