Solar System Assignment

Solar System Assignment-83
Hubble drew upon existing ideas and evidence to demonstrate that the Universe was much larger than previously thought and proved that it is expanding — laying the foundations for the Big Bang theory. In one second it races around the Earth seven times. Going out to the stars, Astronomers know that by studying Cepheid variables, the fluctuation in brightness of certain stars, we can calculate the star's distance from Earth.The longer the period of fluctuation, the brighter the star.

Hubble drew upon existing ideas and evidence to demonstrate that the Universe was much larger than previously thought and proved that it is expanding — laying the foundations for the Big Bang theory. In one second it races around the Earth seven times. Going out to the stars, Astronomers know that by studying Cepheid variables, the fluctuation in brightness of certain stars, we can calculate the star's distance from Earth.The longer the period of fluctuation, the brighter the star.

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So even though a star might appear extremely dim, if it had a long period it must actually be extremely large.

The star appeared dim only because it was extremely far away.

Bursts of super-hot plasma on the Sun can sometimes rise to a height more than 30 times the diameter of the Earth.

The explosive activity can also generate "solar winds" that may affect the weather on Earth.

By calculating how bright it appeared from Earth and comparing this to its intrinsic brightness, Astronomers could estimate how much of the star's light had been lost while reaching Earth, and how far away the star actually was. Different elements joining, colliding, breaking apart, and joining again is a very ferocious stage in the life of any planet.

In the scale of the Universe, light would take eight minutes to reach the Sun. Even after the Earth formed, when the atmosphere began to stabilize, it was under siege.It took billions of years for the Earth to form and settle into orbit around the Sun. To study the movements of heavens back then, you would look up into the sky.You would see the Sun and stars revolve around the very spot where you were standing, the Earth — just as Ptolemy did some 1,900 years ago.Ever since the Big Bang, the Universe has been drifting and expanding.The birth and death of stars leave an aftermath of galaxies, planets, and even living organisms.And learn about Earth's drifting surface that causes earthquakes, volcanic eruptions, and continental "surfing." It was five billion years ago. And some of this material clumped together, settling into a protoplanetary orbit.A giant cloud of matter in our own galaxy, the Milky Way, condensed under its gravity, exploding in nuclear fusion. Those chemically rich leftovers orbiting our young Sun were stewing with all the ingredients to form the planets in our Solar System.And four years to reach Proxima Centauri, the next nearest star. Early microbes, in their struggle for life, clashed with and consumed hydrogen gas. These microbes evolved into prokaryotes and adapted further, finding energy in sunlight.Then, in a process called photosynthesis, they flooded the atmosphere with oxygen.Earth was at a center of a series of concentric spheres containing the Moon, the planets, the Sun, and a final sphere of fixed stars.By measuring the amount of time between the fluctuating brightness levels of variable stars, Leavitt discovered that it would be possible to estimate their distance away from the Earth, and possible to map the Universe.

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