The sun is a star, there are billions of stars out there and sun is one of them. The sun has its own planetary system. The Geeks called the sun “Helios” and the Romans called it “Sol”. The sun made up of about 70% of hydrogen and 28% of helium and 2% of other (metals). The sun changes hydrogen into helium in his core.
It is about 90% hydrogen and 10% helium with traces of methane, ammonia, water and rock. Jupiter’s interior is very similar to the Sun’s interior but with a far lower temperature. However, it is still unknown but Jupiter is believed to have a core of liquid metallic hydrogen. This exotic element can only be achieved at pressure greater than 4 million bars. Jupiter radiates more energy in space than it receives from the sun.
Extrasolar planets are a fascinating study in the field of astronomy. Since the first one was discovered back in 1992, scientists and planet hunters have confirmed more than one thousand exoplanets out of more than three thousand candidates. An extrasolar planet is any planet outside our own solar system. The importance of finding them is not just for the knowledge they are present in our universe, but to find possible earth-planets as well. You cannot take your average telescope and point to the heavens and find an exoplanet, though.
Internal Heat: Jupiter is a heat source; it radiates 1.6 times as much energy as it receives from the sun. Magnetic Field: Jupiter has a very strong magnetic field. The magnetic field is probably generated as the planet spins its deep metallic-hydrogen layer with electrical currents. Spacecraft Visits: Jupiter was first visited by NASA's Pioneer 10, which flew by Jupiter in 1973. Later fly-by visits included: Pioneer 11, Voyager 1, Voyager 2, Ulysses, and Galileo.
Extraterrestrial life is life originating from elsewhere in the universe. Irrefutable scientific evidence of extraterrestrial life is yet to be found, but a lot of better evidence is found every now and then. Most scientists accept the idea of extraterrestrial life, stating that taking into account that our universe’s size, the number of galaxies, and most importantly the number of earth-like planets, are beyond our imagination. The above shows that if no life is found in our solar system, then that has no proof whatsoever that no extraterrestrial life exists. The universe is vast, way beyond our imagination.
Over time planetesimals get big enough to attract bigger bodies which form protoplanets, which then form planets. Planetesimals over time form planets, but there are two types of planets known in the universe, Terrestrial Inner Planets and Outer Giant Gaseous Planets. Terrestrial Inner Planets V.S Outer Giant Gaseous Planets Inner and Outer planets are different by many characteristics. The 4 inner planets are known as terrestrial planets because they’re quite similar to Earth, due to their solid surface. Inner planets are made up of iron and nickel and have few or no moons.
Pluto is about half the size of the United States, which sounds big, but considering Jupiter, the largest planet in the solar system, is 1,300 times the volume of Earth. To further reinforce the extremely small size of Pluto is the fact that Earth’s moon is larger than the dwarf planet. Also, Pluto’s moons are only about 100 miles wide, which is about as wide as Missouri. In general Pluto is just extremely small, small enough to no longer be considered a legitimate planet. Many scientists theorize that Pluto might actually have once been a moon of Neptune.
A star’s habitability depends on how much star light it absorbs and reflects which determines its temperature (Astrobio Website). 2.2 Super-Earths A super-Earth is a planet with masses between one and ten times that of Earth (Phys Org Website). They have a 41% incidence in habitable zones (Phys Org Website). 2.3 Missions/Organizations Due to the difficulties in detecting an exoplanet becau... ... middle of paper ... ...zone, methane, and water (Space Telescope Science Institute Website). It will be able to reveal what drives star formation, and interactions between dark matter and galaxies (Space Telescope Science Institute Website).
However, the real trouble came when they discovered a planetary object called Ceres. Objects like Ceres and Pluto behaved similarly to regular planets. Because of the limitations on the technology at the time, it was very difficult to observe precise details about these objects. As a result, they had a tough problem whether to classify it as a planet. During the 1990’s, scientists discovered more Pluto like objects in the Kuiper Belt.
But what did people think about this in ancient times? Today, how do we find these planets? It is very difficult and hard to find exoplanets. To find exoplanets, scientists use what is called the Doppler technique. This technique uses the Doppler effect to analyze the motion and properties of a star and a planet.