The History of Everything Part 1: Where the Earth Came From
April 22nd, 2018
In this episode of SkyTour Radio, we discuss exoplanets Kepler 444 and PSR B1620-26b in our continuing weekly exoplanet roundup. Then, we present the first of many bit sized segments of The History Of Everything, starting right here at home with The Formation Of Earth. We discuss how elements are created across the universe, how they bond, fuse and collapse and where it all goes from there.
Preliminary results of the planetary system around Kepler-444 were first announced at the second Kepler science conference in 2013 and in January 2015, the Kepler spacecraft is reported to have confirmed the detection of five sub-Earth-sized rocky exoplanets orbiting the star.
The Kepler-444 system consists of the planet hosting primary and a pair of M-dwarf stars. The M-dwarfs orbit each other at a distance of less than 0.3 AUwhile the pair orbits the primary in a highly eccentric 198 year orbit. The pair comes within 5 AU of the primary potentially severely truncating the protoplanetary disk from which the planets formed at 1–2 AU.
All five rocky exoplanets are confirmed, smaller than the size of Venus but bigger than Mercury and each of the exoplanets completes an orbit around the host star in less than 10 days.
An extrasolar planet located approximately 12,400 light-years away from Earth in the constellation of Scorpius, it bears the unofficial nicknames “Methuselah” and “the Genesis planet” due to its extreme age.
The planet is in a circumbinary orbit around the two stars of PSR B1620-26 which are a pulsar (PSR B1620-26 A) and a white dwarf (WD B1620-26) and is the first circumbinary planet ever confirmed. It is also the first planet found in a globular cluster. The planet is one of the oldest known extrasolar planets,believed to be about 12.7 billion years old.
PSR B1620-26 b has a mass of 2.5 times that of Jupiter, and orbits at a distance of 23 AU (3.4 billion km), a little larger than the distance between Uranus and the Sun. Each orbit of the planet takes about 100 years.
Earth revolves around the Sun in 365.26 days, a period known as an Earth year.During this time, Earth rotates about its axis about 366.26 times.
Earth’s axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth’s orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.
The formation and evolution of Solar System bodies occurred along with the Sun.In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into a circumstellar disk, and then the planets grow out of that disk along with the Sun. A nebula contains gas, ice grains, and dust (including primordial nuclides). According to nebular theory, planetesimals formed by accretion, with the primordial Earth taking 10–20 million years (Mys) to form.
SkyTour Radio explores the Universe in a down to Earth manner explaining the science we know in fun and bite-sized terms. Science is for everyone and people shouldn’t require an advanced degree to understand as long as it is delivered in an easy to follow way. From Black Holes to Extraterrestrial Life, we will explore the Universe like never before. Join us to check out such things as how stars form, how they live and, how our fate is intertwined with theirs. On the extraterrestrial life front, we will be speaking to the UFO and science arena’s top researchers and bring UFOlogy into the 21st century.
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