Extrasolar Planets That Orbit a Star

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Astronomy
Question 1
An extrasolar planet is a certain kind of the planet that revolves around a star. This kind of the planet is part of the solar system because it takes part in orbiting another star. Extrasolar planet is also known as the exoplanet. There are discoveries that have been made about these extrasolar planets and they include; 51 Pegasi b exoplanet. The scientists gave a confirmation that 51 Pegasi b was the first planet orbiting the star that looked like the sun. This planet revolves around its sun at estimated distance of that of mercury. One of the side of the 51 Pegasi b normally faces the star. This is because it is very close to the original star (Perryman 120).
The other discovery is HD 209458 which was the first planet found in the year 1999. It was found to transit own star. This extrasolar planet was the first to be outside the solar system. This means that its temperature could be determined including the reasons to the lack of clouds.
Thirdly, 55 Cancri e is a super Earth that orbits a bright star. The star orbited is very bright and can be seen by the eye (Perryman 120). This implies that this extrasolar planet can be studied in more details than the other stars.
Finally, WASP-33b was a discovery done in the year 2011. This planet contains a sunscreen layer that absorbs the ultraviolent light from the star that it orbits. It orbits the star in a backward way.
The reason to why few extrasolar planet shave been discovers is because of the difficulty in detecting them. They have very faint light (Perryman 121). The light from the parent planets are very bright and thus it causes glare which makes them disappear.
Question 3
The planet earth has never been visited by the aliens from the other planets. There are scientific reasons to this believe. The first reason is that, the nearest galaxy to earth is Andromeda which is more than two million years in distance (Shoemaker et al 354).This implies that the aliens will have to travel for more than two million years to earth. The second reason is that the Andromeda is large compared to earth and life in it would be many times that in earth. This gives good reason to why they have not visited earth. Thirdly, there will be a problem for the aliens to detect human beings in earth. This is because earth has been sending the waves to the Andromeda for 100 years now. It means that light will take 2 million years before it reaches the surface of the other galaxy. This shows that aliens have not been on earth before (Shoemaker et al 355).
Question 4
Some of the UFO sightings include; there was a strange light over the Arkansas which led to many speculations. Later on, it turned out that the airplanes dropped the flares while on training. This occurred in 2007.
Another UFO was in New Jersey which led to baffling. They were later on reported to be balloons of helium. They were only part of the social experiment being carried out.
Lastly, in 2010, the Manhattan UFO occurred and were reported as the balloons of helium that were from the school party (Scott & Raymond 190).
Some of the causes of false sightings include; people will sight the UFOs for the ulterior intentions such as earning money through selling the newspapers the story, as a cover up for some carelessness and even to cover the false activity (Scott & Raymond 200).
People will also rush to conclusions by not identifying the reality. For instance, balloons at events can create different opinions and misunderstanding. Pranksters are another cause as they are ready to make people see UFOs. The other cause is that some of the sightings can put together events that are not related at all. Another cause is the prejudgment of people (Scott & Raymond 200). They will always think of the UFOs each time something unfamiliar happens. The final cause is that the failure of the power can cause the UFOs.
Work cited
Perryman, Michael AC. “Extra-solar planets.” Reports on Progress in Physics 63.8 (2000): 120.
Scott, Raymond. “BEST UFO SIGHTINGS FEBRUARY 2015?? Real UFO With Aliens Caught On Camera?? NEW 14.” (2015).
Shoemaker, Jennifer S., Ian S. Painter, and Bruce S. Weir. “Bayesian statistics in genetics: a guide for the uninitiated.” Trends in Genetics 15.9 (1999): 354-358.