4 outer planets become large enough to accrete dust and gas forming gas giants or 2.. instabilities in the cooler region of solar system cause a collapse of initial interstellar cloud. Random: Kuiper Belt lie beyond Neptune, close to ecliptic, also where most comets(originate from oort cloud) orbit. denser planets are closer to sun, Saturn can float, in differentiated bodies denser materials lie near core, density=mass/volume. Auroral happens due to solar winds displaced poleward by magnetic field. Deepest depression= Mare Crisium on moon.
Mercury is the innermost and smallest planet as well as having the most eccentric orbit the eight planets in our Solar System. Mercury’s terrain is rocky and heavily cratered closely resembling Earth’s moon, having no atmospheric protection against meteoroids or debris colliding with the surface, causing huge dents. The outer crust of mercury is believed to be very thin, much thinner than earths, its shell only being 500 to 600 km thick. It has been found that Mercury is the second densest planet of our solar system, earth being the first. It has a metallic core which makes up 75% of the planets radius.
Phobos will eventually crash into Mars or break up and form a ring around the planet. Deimos (which means fear) was named after the Greek God Deimos who was the twin brother of Phobos. Deimos is the outer moon so it is further away from Mars and takes about 30 hours to orbit. It is small and lumpy and has lots of craters and is covered in dust and loose rocks. Although it has many craters it’s surface is much smoother than Phobos’ Deimos has an average radius of 6.2
Introduction: A sphere that is of gas and held together by its own gravitational force is known as its most common name, star. Stars are always continually trying to collapse by the force of gravity, this is contracted by the pressure of hot gas/ or radiation in the stars interior. This is called Hydrostatic support. Another thing about stars would be they sometimes come in groups known as clusters. (Dr. Barbara Mattson, 28-Dec-2010) A star cluster or star clouds are groups of stars.
The Geology of the Moon Approximately 4.5 billion years ago a large asteroid struck Earth and thus resulted in the Moon. This impact theory suggests that the collision ejected raw materials which in time became the Moon. With the Moon having no significant atmosphere, it can reserve a good record of the impact history. This information can provide geologists with clues to the history of the Earth. The crust of the Moon is composed of a variation of primary elements, including uranium, oxygen, thorium, potassium, silicon, magnesium, iron, titanium, calcium, aluminum and hydrogen.
Life Cycle of a Star Pamela Hughes May 17, 2011 SCI/151 Norman Stradleigh Life Cycle of a Star On a clear dark night, one can see thousands of stars. We can see many stars but could never dream of being able to count them all. Even though each individual star is unique, all stars share much in common. The Sun, which is the source of virtually all light, heat, and energy reaching the Earth, is the nearest star. Today, we know that stars are born from interstellar gas clouds, shine by nuclear fusion and then die, sometimes in dramatic ways.
Yes, the sun does spin, or rotate. Because it is a gas, it does not rotate like a solid. The sun actually spins faster at its equator than at its poles. There is no fixed rate of rotation of the Sun, on its own axis. At the equator, the Sun's rotation period is 25.05 days.
Gravitational Force of Bodies All bodies with mass exert a gravitational pull on the bodies around them, even you and me. The larger the radius and mass of the body the larger the force. Most people know that the force of gravity on earth is much greater than on the moon, but how much larger is it, and how is gravity calculated? German astronomer Johannes Kepler (1576-1630) spent years observing the motion of planets and developed a set of laws for planetary motion. Years after his death Physicist Isaac Newton (1642-1727) used these laws to help him develop his law of universal gravitation.
The moon also affects the length of day. With the moon’s gravity constantly pulling on Earth, the earth’s rotation slows down dramatically. This is what gives us our twenty four hour days. If we did not have the moon, Earth would spin fast giving us only eight hour days! That would mean only three to four hours of sunlight per day!
The friction heats the gases and causes them to glow from the stellar gas falling into the black hole over time. The author argues that astronomers discovered the first black hole shredder stars, using the ROSAT satellite, which was launched in 1990 with the objective of survey the low energy X-ray sky. According with her the calculations based on ROSAT observations show that a galaxy’s central black hole might gobble a close passing star every 100,000 years or so. Gezari provides evidence that when a black hole chows down on tidally disrupted debris, the temperature of the inspiraling gas can climb to 1 million degrees. Also, she argues that Most of the light is X-rays, but a tail of emission extends to longer, ultraviolet and optical wavelengths.