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Interesting facts about space.

Multiple Light Sources. On the moon, there is only one light source sufficiently strong to form shadows; the Sun. So it is solid to suggest that all shadows on the Moon should run parallel to each other. However, this was apparently not the case during the moon landing.



and here is another

Kepler-22b sports an orbital period of approximately 200 days. Its inclination is about 90 degrees, and it transits in front of the face of its star as observed by Earth-based astronomers. The shape of Kepler-22b's orbit is unknown, but it is known that its average orbital distance is well within its parent star's habitable zone. Many extrasolar planets are known to sport highly elliptical (football-shaped) orbits, and if Kepler-22b also travels along such a path around its star, it would only spend a tiny fraction of its time within this Goldilocks zone. This would cause the planet to undergo such extreme variations in temperature that it would not be a pleasant place for delicate living things to evolve and flourish. Kepler-22b is approximately 2.4 times the radius of Earth.



and finally

Triton also possesses a thin atmosphere composed mainly of nitrogen, and a smaller quantity of methane. This atmosphere probably is the result of Triton's cryovolcanism, which is enhanced by seasonal heating from the Sun. Although little is currently known of Pluto's atmosphere, it is thought to be primarily composed of nitrogen with some carbon monoxide and methane added to the mix--and it is extremely tenuous. Pluto's very thin atmosphere may exist as a gas only when Pluto is nearest to the Sun (perihelion). For most of Pluto's very long year, the atmospheric gases are frozen in the form of ice on its extremely frigid surface. One year on Triton is almost 248 Earth-years long--or 90,471 Earth-days!

Other facts:

The most detailed pictures of Europa show even more intriguing clues that there is slush lurking beneath its brightly shining icy surface. Slightly smaller than Earth's own beloved Moon, Europa's surface temperature could easily freeze an ocean solid over a span of only several million years. However, some astronomers think that warmth from a game of tidal tug-of-war between Europa and Jupiter, as well as other neighboring moons, could be keeping large regions of Europa's subsurface global ocean in a life-friendly liquid state. This process is termed tidal heating, and it refers to a mechanism whereby the gravitational tugs of a nearby object (or objects) flex and bend and contract and expand another object continually. This constant churning causes the victimized object, in this case Europa, to heat up and be considerably more balmy than its great distance from the Sun would otherwise allow it to be.



The relatively light regions of the Moon are known as the highlands. The dark features, the lunar maria, are impact basins that were later filled with lava between 4.2 and 1.2 million years ago. These light and dark regions were created by rocks of different ages and compositions. This provides evidence for how the ancient crust may have crystallized from a global lunar ocean of magma. The impact craters have been preserved for billions of years, and they provide observers with an impact history for our Moon and other bodies that inhabit the inner Solar System.



"A major difficulty has been to explain why a giant impact on Mars would have left two moons so different from our own Moon, a huge single mass, that also formed from Earth undergoing such an impact," explained Dr. Sebastien Charnoz in a July 4, 2016 Centre National de la Recherche Scientifique (CNRS) Press Release. Dr. Charnoz is a planetary scientist at the Institut de Physique Du Globe De Paris (IPG) who contributed to the new research.