Earth orbits the Sun at anaverage distance (aka. semi-major axis) of 149,598,261 km – or one Astronomical Unit (AU). This orbit has a very minor eccentricity (approx. 0.0167), which means its orbit ranges from147,095,000 km (0.983 AU) at perihelion to 151,930,000 km (1.015 AU)...
The calculation shows that relative to larger Earth approachers, SEAs are deficient in Aten-type orbits for which the semimajor axis is less than 1.0 AU. Instead, nearly all SEAs with aphelia less than 1.4 AU (5 ± 3% of the total population) have perihelia between 0.9 and 1.1 AU, ...
This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth...
After being informed of the truth, Shura sacrificed himself to blow up a Dalek attack force once Auderly House was emptied, changing the future. (TV: Day of the Daleks) On another occasion, the release of Sutekh in 1911 meant that by 1980 the Earth would become a desolate planet ...
The lithospheric outer shell of Earth is not one continuous piece but is broken, like a slightly cracked eggshell, into about a dozen major separate rigid blocks, orplates. There are two types of plates, oceanic and continental. An example of anoceanic plateis thePacific Plate, which extends...
We find a non-zero Yarkovsky parameter, A2 = (−2.899 ± 0.025) × 10−14 au d−2, with induced semi-major axis drift of (−199.0 ± 1.5) m yr−1 for Apophis. Our results provide definite collision probability predictions for the close approaches in...
The mass-loss timescale of the sub-Neptune LP 791-18c is greater than the mass-loss timescale of the Earth-sized LP 791-18d for all planet masses, radii, and semi-major axes consistent with our observations, indicating that the planet pair is consistent with both the model of photo...
Before calling all close-in and high-density planets Mercury-like, we should keep in mind that Mercury has a semi-major axis of 0.387 AU, a radius of 0.3829 REarth, a mass of 0.055 MEarth, and a density of 5.427 g cm−3. The USPs, instead, have a 50 to 170 times larger ...
In terms of its orbit, Earth has a very minor eccentricity (approx. 0.0167) and ranges in its distance from the Sun from 147,095,000 km (0.983 AU) at perihelion to 151,930,000 km (1.015 AU) at aphelion. This works out to an average distance (aka. semi-major axis) of 149,598,26...
a, The mass of each planet in every simulated Solar System as a function of the semi-major axis. Planets within the grey zone are considered to be Earth-like. Planets at the distance of Mars from the Sun are too massive in classical simulations but are correct in Grand Tack simulations....