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.
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!
These two moons are also very dark and are thought to be captured asteroids. Phobos is 7.24 times larger than Deimos. It is named after the Greek god Phobos (which means “fear”). Phobos orbits 6,000 kilometers (3,700 miles) from Mars’ surface. No other moon orbits closer to its planet.
It has a metallic core which makes up 75% of the planets radius. Radar images taken indicate that the core of mercury is in fact liquid and not solid like earth’s core. The core of mercury has an abundance of iron, much more iron than any other planet. This iron generates a magnetic field around the planet, only one precent as strong as Earth’s magnetic field. This field is said to be active and frequently interrelating with the solar wind and channelling plasma into Mercury’s surface from the sun.
(Dr. Barbara Mattson, 28-Dec-2010) A star cluster or star clouds are groups of stars. Star clusters can be distinguished as global clusters, which are roughly spherical groupings of from10, 000 to several million stars packed into regions of from 10 to 30 light years across. They commonly consist of very old Population II stars—just a few hundred million years younger than the universe itself—which are mostly yellow and red, with mass just less than two solar masses. Such stars predominate within clusters because hotter and more massive stars have exploded as supernovae, or evolved through planetary nebula phases to end as white dwarfs. Open clusters are very different from globular clusters.
This is referred to as the Synodic rotation period, whereas the former is the Sidereal rotation period. Now don't confuse this with modern techniques used to estimate the mass of an object by its spin. This kind of measurement is similar to relative dating techniques. The idea is that all things in our solar system are VERY old and that they have all been influenced by roughly the same gravitational forces and that they are mostly the same age. These estimates are used largely to guess the mass of asteroids and comets.
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. The Moon exhibits many same materials and characteristics as early Earth. Moon rocks and cores that the Apollo missions yielded back to Earth proved the Moon to be covered with ancient basaltic lava flows. The Moon’s surface is covered by a dusty outer rock layer called regolith. The Moon shows considerable evidence of past volcanic activity.
When the temperature gets high enough, hydrogen nuclei undergo nuclear fusion to form helium nuclei and give out massive amounts of heat and light. Before the star begins its life, there are the components that will create the star. However, the ultimate demise of a star is somewhat of a mystery. The most interesting aspects during creation and during death, what happens during life, at least for star, are quite inconsequential. Before there was space, there was a set amount of matter.
Q60. The radius of the Earth and the radius of Jupiter are in the approximate ratio 1 : 11. The mass of the Earth and the mass of Jupiter are in the approximate ratio 1 : 320. You will need the following information. The Earth and Jupiter are spherical The volume of a sphere of radius r is (a) Show that the approximate ratio of the volume of the Earth to the volume of Jupiter is 1 : 1331.
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.