There are two theories as to how planets in the solar system were created. The first and most widely accepted, core accretion, works well with the formation of the terrestrial planets like Earth but has problems with giant planets. The second, the disk instability method, may account for the creation of giant planets. Scientists are continuing to study planets in and out of the solar system in an effort to better understand which of these methods is most accurate. The core accretion model Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. With the rise of the sun, the remaining material began to clump up. Small particles drew together, bound by the force of gravity, into larger particles. The solar wind swept away lighter elements, such as hydrogen and helium, from the closer regions, leaving only heavy, rocky mater...
Moon has five phases. New moon-which we can not see it is invincible to human eyes, so when moon does not show at night, know it that it is in the new moon phase. Crescent-this is the first phase after the new moon that is visible, is not fully curved and is small and tiny. Half moon- After the crescent phase, half moon emerges, this is the half division of the full moon. GIBBOUS -the gibbous is a bit bigger than the half moon, it is a pregnant half moon. Full moon- this is the full shape of the moon, and after full moon it goes back to new moon that we can not see. N/B -MOON IS Luminous object, it can not produce light on its own, it reflects light from the sun. Moon calendar
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