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Planets

A planet is an object orbiting a star or stellar remnant that is large enough to be rounded by its own gravity. However, it is not large enough to cause thermonuclear fusion and has cleared its neighbouring region of planetesimals. Planets are divided into two main categories, low-density gas giants, and smaller rocky terrestrials.

In the Earth’s solar system there are eight planets. The four terrestrials are located closest to the sun. The four gas giants are the furthest from the sun. The eight planets in the solar system in order from increasing distance from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Six of the eight planets are orbited by one or more natural satellites. There are also five recognized dwarf planets in the Solar System, Ceres, Pluto, Haumea, Makemake and Eris.

Since 1992, hundreds of other planets orbiting around stars in the Milky Way have been discovered. These planets range in size and characteristics from the terrestrial planets similar to Earth and the gas giants larger than Jupiter.

Each planet has its own physical characteristics. They will each have a unique mass, internal differentiation, atmosphere and magnetosphere. This is precisely why life cannot be sustained on every planet. However, exploring other planets allows scientists to see clues on how the universe was created.

The Assayer by Galileo

Why did Galileo write "The Assayer" and what it is about? Why did Galileo chose this title, and what he meant to convey by doing so? What does Galileo means when he says, "nature takes no delight in poetry." Why is science NOT like poetry? What IS science like, according to Galileo? What was the importance of mathematic

Luminosity of a pulsing star

In this problem we will make a crude estimate of how the luminosity carton of a pulsating star s related to the variations in its radius. This provides a way of estimating the amount by which the radius is changing for a star that we observe to pulse. We will consider a star whose unperturbed state consists of a luminosity L0 a

Differences Between Uranus and Neptune

Hi Professor Miller. Any insight on significant differences between Uranus and Neptune? They are traditionally known as twins. Your input is always welcome! Thank you,

Alfred Wegener and Plate Tectonics Application

Accomplishments of various astronomers and need insight regarding the discoveries of Alfred Wegener. How did he first notice the possibility plate tectonics and what lies in the gap he noted? I am trying to pinpoint and describe various features on the earth's crust explained by plate tectonics.

Discussing Astronomy in regards to Philosophy

How can we talk about the evolution of stars over billions of years when human beings have been observing stars for only a few thousand years? Some advances in our knowledge have been made possible through better equipment, such as Hubble's discoveries using the 100-inch Hooker telescope at Mount Wilson. What other major disc

Practice Problems: Calculating Mercury Rising and Applied Force

I'm having trouble completing these practice problems. 1. A barometer is made from a closed tube inserted (closed end up) into a pool of mercury (density = 13.6 g/cm^3). The pool of mercury is open to the air. How high does the mercury rise in the closed tube? 2. A hydraulic lift is used to lift a 1,300 kg car has a di

The alignment of Phobos and Deimos from Mars.

Hi. 3. Phobos, the inner moon of Mars, has an orbital period of 0.32 days. Deimos the outer Martian moon has a period of 1.26 days. How often will Phobos and Deimos be aligned as seen from the surface of Mars? Please include the formula and units also. Thanks.

Sidereal period and synodic period of a hypothetical planet

A hypothetical planet travels in an elliptical orbit around the Sun. The perihelion distance is 2.65 AU and the aphelion distance is 2.85 AU. For this hypothetical planet determine: a) the semi-major axis of its orbit. b) the sidereal period. c) the synodic period as seen from the Earth.

Life on Mars

Please help answer the following questions regarding whether life ever existed on Mars. Include references. Do we know whether Mars ever had life at any time during its past? What argues in favor of the position that it may once have harbored life?

Normal and Active Galaxies

Over 200 word response with reference that compares normal and active galaxies. Please help with the following problem. Name two basic differences between normal and active galaxies. How do astronomers account for the differences in the spectra observed from active galaxies?

Testing the Theory of General Relativity

Please provide an over 200 word response with reference that describes how to test the theory of general relativity. Why is it so difficult to test the predictions of the theory of general relativity? Describe two tests of the theory.

How (and why) do the thickness of Saturn's various layers (clouds, molecular, and metallic hydrogen, core) compare to those in Jupiter?

Sidereal and Solar Days - Earths rotation

Please help with the following problem: Contrast the sidereal and solar days. How, and by roughly how much, would the length of the solar day change if Earth's rotation were suddenly to reverse direction?

Really need physics help, in military and deployed

A car is driving along a straight section of highway between Oklahoma City and Tulsa. At one point in time, the car is 30 miles from OKC. At a later point in time, it's 10 miles from OKC. What is its displacement An aircraft flies 20 km on a course of 030 degrees, then 30 km on a course of 270 degrees. What is its distan

Physics: U-Tube Mercury Level Sample Calculation

Please find the attached problem for the graph. The u-tube shown has a cross-section of 1 cm^2. It contains mercury to the shown levels. The pressure above the the mercury is 750 torr. The left side is sealed off. The right side is is pumped such that the pressure is approximately zero. How are we supposed to calculate ho

Estimating Total Kinetic Energy of a Planet

Estimate the total KE (kinetic energy) of a planet in its orbit around a star by finding its rotational KE about its axis and its translational KE around the star. The planet's mass is 4 * 10^24 kg, it turns on its axis once every 32 hours, it orbits in a nearly uniform circle at a distance of 2.3 * 10^8 kilometers from the sta

Determination of the mass of a planet from orbital dynamics

A satellite of mass 830 kg orbits a planet of unknown mass at a distance of 29100 km from the planet's center. The orbital velocity of the satellite is 14200 m/s. * What is the mass of the planet? * How much would potential energy (PE) and kinetic energy (KE) of this satellite change as the satellite moved from a circular

Mass of Neptune Guide

The mass of Neptune is about 1.03 x 10^23. The mass of the sun is about 1.998 x 10^27 metric tons. About how many times the mass of Neptune is the mass of the sun? Give your answer is scientific notation. Round to the nearest thousandths as needed.

Potential Resources about an alien world

The Scenario: You are a team of official investigators, sent by Earth authorities to research the possibility of establishing diplomatic relations with a newly discovered world. Your job is to investigate the planet and produce a report summarizing your findings and suggesting means for establishing relations. Three question

Extrasolar planets

How many extrasolar planets have been discovered to date. Describe two ways of detecting extrasolar planets?

meteor, a meteoroid, and a meteorite

Explain the difference between a meteor, a meteoroid, and a meteorite. What causes a meteor shower? What do meteorites reveal about the age of the solar system?

Comets Orbital in a Solar System

Where in the solar system do most of the comets reside? What are the parts of a comet when it is near the Sun? Describe two ways in which a comets orbit may change.