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The heliospheric current sheet, or interplanetary current sheet, is a surface separating regions of the heliosphere where the interplanetary magnetic field points toward and away from the Sun. [1] A small electrical current with a current density of about 10 −10 A /m 2 flows within this surface, forming a current sheet confined to this surface.
Giant planets can significantly influence terrestrial planet formation. The presence of giants tends to increase eccentricities and inclinations (see Kozai mechanism) of planetesimals and embryos in the terrestrial planet region (inside 4 AU in the Solar System). [62] [66] If giant planets form too early, they can slow or prevent inner planet ...
If this system forms planets, the inner planets will likely orbit in the opposite direction to the outer planets. [35] WASP-17b was the first exoplanet that was discovered to be orbiting its star opposite to the direction the star is rotating. [36] A second such planet was announced just a day later: HAT-P-7b. [37]
up to one Sun or Moon diameter (about 0.5° or 30') every 2 minutes; up to one diameter of the planet Venus in inferior conjunction (about 1' or 60") about every 4 seconds; 2,000 diameters of the largest stars per second; Star trail and time-lapse photography capture diurnal motion blur. The apparent motion of stars near the celestial pole ...
On a prograde planet like Earth, the stellar day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360 degrees and the distant star is overhead again but the Sun is not (1→2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead ...
At their distance from the Sun, accretion was too slow to allow planets to form before the solar nebula dispersed, because the initial disc lacked enough mass density to consolidate into a planet. The Kuiper belt lies between 30 and 55 AU from the Sun, while the farther scattered disc extends to over 100 AU, [ 43 ] and the distant Oort cloud ...
Spotting the planets will require clear skies since Mercury and Jupiter only get about 6 degrees above the horizon by the time the sun rises around 5:30 am, said Teets.
This could eject it from the Solar System altogether [1] or send it on a collision course with Venus, the Sun, or Earth. [11] Mercury's perihelion-precession rate is dominated by planet–planet interactions, but about 7.5% of Mercury's perihelion precession rate comes from the effects described by general relativity. [12]