Any model of the origin of the solar system must explain why all the planets orbit the Sun in the same direction and in nearly the same plane. One model that wasdevisedexplicitly to address this issue was the tidal hypothesis, proposed in the early 1900s.Two nearby planets, stars,...
How was the solar system built? (cover story)The article discusses the story of the birth of the solar system. A story reveals that they are blood siblings, all created from the same molecular cloud whose collapse formed the sun. It says that when the sun formed, it swallowed about 99.8...
How much do you know about the solar system?The following passage will tel you something about it.The Earth is a planet. It as well as seven 1planets goes around the sun. We 2 the eightplanets and the sun the solar system. The first planet,the sun,is Mercury(水星).It is 58 ...
Learning practice- use what you know to answer questions about when our solar system was formed and what scientists think caused it Additional Learning To find out more about the sun and other details about our solar system, read the lesson titled Formation of the Solar System: Lesson for Kid...
Formation of the Moon: It was also during this eon – roughly 4.48 billion years ago (or 70–110 million years after the start of the Solar System) – that the Earth’s only satellite, the Moon, was formed. The most common theory, known as the Giant Impact Hypothesis proposes that the...
This picture of Earth has, in just the past two or three decades, completely changed the traditional view of the planet's early history, and in particular of how it developed oceans. As long as it was thought that Earth condensed from a giant gaseous planet embryo, or that it grew gently...
theory for how our solar system could have formed in the wind-blown bubbles around a giant, long-dead star. Published Dec. 22 in theAstrophysical Journal, the study addresses a nagging cosmic mystery about the abundance of two elements in our solar system compared to the rest of the galaxy...
Like the other planets, Earth formed from the leftover cloud of dust and gas orbiting the young sun. The early solar system was a violent place, and a number of bodies were created that never made it to full planetary status. One of these could have crashed into Earth not long after ...
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According to the solar nebula theory, the sun formed around 4.5 billion years ago from a massive cloud of gas and dust in space [source: NASA]. Imagine a huge cloud in space that shrinks and spins because of outside forces. This cloud becomes a flat, spinning disk, called a solar nebul...