Sunday, March 29, 2020

Astronomy †Distance in The Stars and The Solar System

Astronomy – Distance in The Stars and The Solar System Free Online Research Papers Astronomy Distance in The Stars and The Solar System ***All italic words are located at the bottom accompanied by their definitions*** The Solar System The solar system consists of the Sun, nine planets, sixty-eight satellites (of the planets), large numbers of comets and asteroids, and the interplanetary medium. All the planets orbit in the same counter-clockwise direction looking down from above the Sun’s north pole or in a prograde direction. All except for Venus and Uranus, whose rotations are defined as retrograde. The nine planets are classified in several ways: By composition: Terrestrial or rocky planets: Mercury, Venus, Earth, and Mars: The terrestrial planets are composed mostly of rock and metal and have relatively high densities, slow rotation, solid surfaces, no rings and very few satellites. o Jovian or gas planets: Jupiter, Saturn, Uranus, and Neptune: ? The gas planets are composed primarily of hydrogen and helium, and generally have low densities, rapid rotation, deep atmospheres, rings and lots of satellites. By size: o Small planets: Mercury, Venus, Earth, Mars and Pluto. ? The small planets have diameters less than 13000 km. o Giant planets: Jupiter, Saturn, Uranus and Neptune. ? The giant planets have diameters greater than 48000 km. o Mercury and Pluto are sometimes referred to as lesser planets (not to be confused with minor planets which is the official term for asteroids). o The giant planets are sometimes also referred to as gas giants. By position relative to the Sun: o Inner planets: Mercury, Venus, Earth and Mars. o Outer planets: Jupiter, Saturn, Uranus, Neptune and Pluto. o The asteroid belt between Mars and Jupiter forms the boundary between the inner solar system and the outer solar system. By position relative to Earth: o Inferior planets: Mercury and Venus. ? They are closer to the Sun compared to the Earth. ? The inferior planets show phases like the Moons when viewed from Earth. o superior planets: Mars thru Pluto. ? farther from the Sun than Earth. ? The superior planets always appear full or nearly so. By History: o classical planets: Mercury, Venus, Mars, Jupiter, and Saturn. ? known since pre-historical times ? visible to the unaided eye o modern planets: Uranus, Neptune, Pluto. ? discovered in modern times ? visible only with telescopes Stars: Are huge spherical masses of gas that began radiating energy because of nuclear reactions occurring deep within their interiors They differ in size, shape, luminosity, temperature, and composition Distance To Stars: First measured by Friedrich Bessel in 1838, method called Trigonometric Parallax As the earth moves around the sun, a star relatively nearby will appear to shift its position in the sky relative to more distant stars. By measuring these minute angular shifts, the distance of a star can be determined trigonometrically. Half of the total apparent shift of the star with respect to the background is called the star’s trigonometric parallax. It follows that the parallax of a star is the angle formed t the star by the triangle formed between the star and each end of the radius of the earth’s orbit. Glossary: Jovian planets: The planets with orbits beyond that of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto. Parallax: The apparent change in position of a star relative to the distant, background stars as seen from the Earth at opposite points in its orbit around the sun. Prograde: Counterclockwise, when viewed from north of the ecliptic, rotation of a celestial body around its axis. Retrograde motion: The motion of a planet from west to east among the stars over a lengthy period of time. It is when the earth overtakes another planet as they both orbit the sun. Star: A celestial body made up of hot gases held together by its own gravity and emitting light and heat resulting from its internal nuclear reactions. Our Sun is a typical star. Terrestrial planets: The planets with orbits within the orbit of Jupiter, Mercury, Venus, Earth, and Mars. The Distance To A Star Tan( 1 ) = 93 000 000 Miles 9000 X X= 4.8 x 10 A.U.= Astronomical Unit= 150 million Kilometres = 93 million Miles 1 minute= 1 1 second= 1 60 3600 A= 0.4 seconds = 1 9000 Research Papers on Astronomy - Distance in The Stars and The Solar SystemThe Spring and AutumnWhere Wild and West MeetThe Relationship Between Delinquency and Drug UseCanaanite Influence on the Early Israelite ReligionBionic Assembly System: A New Concept of Self19 Century Society: A Deeply Divided EraIncorporating Risk and Uncertainty Factor in CapitalDefinition of Export QuotasMarketing of Lifeboy Soap A Unilever ProductResearch Process Part One

Saturday, March 7, 2020

Word Choice Disinterested vs. Uninterested

Word Choice Disinterested vs. Uninterested Word Choice: Disinterested vs. Uninterested Here at Proofed, we see plenty of linguistic mix-ups. However, few cause more confusion than â€Å"disinterested† and â€Å"uninterested.† It’s easy to understand why these words sometimes baffle even native English speakers, as they’re alike in many ways. Both are adjectives related to attention, for example, and the prefixes â€Å"dis-† and â€Å"un-† are sometimes used interchangeably. But â€Å"disinterested† and â€Å"uninterested† have importantly distinct meanings, so it’s vital to use them correctly in academic writing. Disinterested (Objective) The word â€Å"disinterested† implies freedom from bias and self-interest. When we want to take a neutral or objective attitude towards something, we would adopt a â€Å"disinterested approach†: Although he cared about the environment, as a scientist, James knew he had to address climate change disinterestedly. Uninterested (Bored) The word â€Å"uninterested,† by comparison, means â€Å"indifferent† or â€Å"bored.† Thus, if we simply have no concern for something, we are â€Å"uninterested†: Although Jane was a environmentalist, she was uninterested in the science behind climate change. The Prefixes: Dis- and Un- One way to remember the difference between these terms is to consider what the prefix at the beginning of each word means. The prefix â€Å"dis-† implies separation (e.g., disconnected, disjointed). So being â€Å"disinterested† is an attempt to look past your own interests: a deliberate attempt to adopt a neutral attitude. The prefix â€Å"un-† in this case implies a negation (e.g., unhappy, unknown). As such, being â€Å"uninterested† is the opposite of being interested: i.e., a lack of interest rather than a deliberate attempt to approach something without bias. Disinterested or Uninterested? As you can see, there’s a huge difference between the meanings of â€Å"disinterested† and â€Å"uninterested.† To make sure you use these terms correctly, remember the following: Disinterested = Neutral or unbiased Uninterested = Indifferent or bored If you can remember this, you should avoid errors in your writing. But since it’s easy to overlook these things, it never hurts to have a professional check your work. Try sending a 500-word sample to be proofread for free.