Planets Universe Solar System cbse science class 4 demo our universe the planets and the Universe Planets Solar System
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A little interesting about space life.
Very long ago, when our Solar System was young, Earth's Moon possessed active volcanoes. However, today, the lunar volcanoes are dormant and have not erupted for millions of years.
and here is another
Because the lunar atmosphere is very thin, it is far too sparse to prevent a steady shower of impacts from tumbling asteroids, comets, and meteoroids. These objects strike the lunar surface, leaving behind numerous crater scars. For example, Tycho Crater is over 52 miles wide.
Mysterious and enticing--a true Wonderland world--Mars has sung its scientific siren's song for years to those who seek to understand its many long-held secrets. This small, rocky world with an intriguing red hue, gets its rusty color from the large amount of iron oxide that coats its surface. Much of this small world's charm comes from its reputation of being the happy abode of "little green men"--Earth's neighboring planet that plays host to life as we know it. However, Mars has many captivating features and bewitching mysteries, in addition to the somewhat dated idea that it is the most likely world in our Solar System--other than our Earth--to host living creatures. The duo of small potato-shaped Martian moons, Phobos and Deimos, are frequently considered to be captured asteroids that the Red Planet's gravity snared when they were making an ancient and unfortunate journey through interplanetary space from their place of birth in the Main Asteroid Belt, located between the orbits of Mars and Jupiter. The duo of rocky objects now circle their adopted parent-planet--at least, for the time being. However, in July 2016, a team of astronomers proposed an alternative viewpoint, suggesting that the two little moons were born from an ancient impact on the Martian surface by a crashing primordial object--along with many other now long-lost little moons.
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The Giant-Impact Theory, alternatively termed the Theia Impact, or Big Splash Theory, proposes that Earth's Moon was born from the debris remaining from a catastrophic collision, that occurred about 4.3 billion years ago, between the primordial Earth and an unfortunate protoplanet, that was about the size of Mars. The Earth's Moon-forming collision would have occurred when our Solar System was still forming during the Hadean eon. The Hadean eon occurred about 20 to 100 million years after our Solar System emerged from its frigid, dark natal cloud of gas and dust. The doomed impacting protoplanet, often called Theia, received its name in honor of a Titan in Greek mythology who was the mother of Selene, the Moon goddess. An analysis of lunar rocks, published in 2016, indicates that this catastrophic crash was a direct hit--causing a thorough mixing of both Earth-stuff and Theia-stuff. The Giant-Impact Theory is the favored scientific explanation for the birth of Earth's Moon.
"A late Moon-forming event, as suggested by our work, is very consistent with an identical Earth and Moon," Dr. Jacobson told Space.com.
Most of the moons of our Solar System are icy little desolate and dead worlds, dwelling in the dark, cold stillness of those regions far from the warmth and light of our Sun. However, a few of these small bodies may not be lifeless. For example, Europa of Jupiter may have a subsurface global ocean of liquid water secreted beneath its cracked, jumbled frozen crust of ice. This subsurface ocean might be warmed by tidal flexing into a hospitable, life-friendly liquid-water state, where primitive life-forms may swim around in the deep-sea darkness beneath Europa's ice. In addition, the second-largest moon in our Solar System, Titan of Saturn, possesses an environment that is eerily similar to that of our own planet long before life evolved out of the lifeless ooze (prebiotic). Big, lazy raindrops of liquid hydrocarbons float to the surface of this tormented, frigid moon, forming seas and lakes composed of methane and ethane that play the same role as water on Earth. It is entirely possible that life, as we do not know it, can evolve and flourish using liquids other than water. The largest moon of our Solar System, Ganymede of Jupiter, is larger than the innermost planet Mercury. Like its sister-moon Europa, Ganymede may hold secreted, beneath its surface crust of ice, a global ocean of liquid water. The little icy moon, Enceladus of Saturn, spews out geysers of water mixed with ammonia (which plays the role of antifreeze) from its so-called "tiger stripes". Therefore, Enceladus could also harbor life-loving water hidden beneath its icy surface.