-
-
-------------------- 2481 - MERCURY - our planet next to the Sun
-
- Today, November 11,2019, Mercury's shadow can be seen somewhere on the Sun's disk.
-
- Over 3 billion people could experience it. Wherever the Sun is visible between 12:35 and 18:04 Universal Time, it will display Mercury’s silhouette.
-
- During the partial phases of a lunar eclipse, the shadow of Earth can be seen on the surface of the Moon, indicating quite clearly that it casts a roughly circular shape. The longest-duration eclipses on Earth are lunar eclipses, which can have a duration of nearly four hours from the beginning of the first partial phase through totality to the end of the final partial phase; transits of Mercury last some 40% longer.
-
- Although transits of Mercury were predicted even in pre-telescope times by Johannes Kepler, the first one was not observed until 1631, when Pierre Gassendi accomplished the feat with documentation.
-
-------- Check out the Web, Google “Mercury transit” and you will find some amazing pictures.
-
- Because Mercury's orbit around the Sun is tilted with respect to the plane in which Earth orbit’s the Sun by about 7°, while the Sun appears to be only 0.5° in angular diameter from Earth, most inferior conjunctions of Mercury ,where it passes between the Earth and the Sun, do not result in a transit. But November 11, 2019 will be one such uncommon instance where a transit does occur.
-
- Only 1-in-23 inferior conjunctions result in Mercury's transit. Mercury, Earth, and Sun so rarely align; Mercury's orbit is inclined 7.005° to Earth's.
-
- Although more than 4,000 confirmed exoplanets are known, with more than half of them uncovered by Kepler, finding a Mercury-like world around a star like our Sun is well beyond the capabilities of our current planet-finding technology. As viewed by Kepler, Mercury would appear to be 1/285th the size of the Sun, making it even more difficult than the 1/194th size we see from Earth's point of view.
-
- More than 4,000 confirmed exoplanets are known.
-
- NASA’s Kepler discovered zero Mercury-like planets around Sun-like stars. Transiting Mercury imperceptibly dims the Sun, reducing its brightness by merely 0.0027%.
-
- Mercury has no atmosphere. Unlike Venus, where atmospherically filtered sunlight appears during transits, Mercury is utterly barren.
-
- Mercury is indeed a planet without an atmosphere.
-
- April 30,2015 the spacecraft MESSENGER crashed in to the planet Mercury at 8,750 miles per hour. This was after 4 years orbiting the planet 4,140 times.
-
- The spacecrafts closest approach in its orbit was 125 miles altitude.
-
- Mercury’s magnetic field is 1/100th the strength of Earth’s magnetic field.
-
- Mercury is 2,032 miles in diameter and it magnetic field is likely generated by an internal dynamo of rotating electric currents.
-
------------- Mercury’s magnetic field = 200 nanotesla
-
------------- Magnetic field from Solar Wind = 50 nanotesla
-
------------- Earth’s magnetic field = 30,000 nanotesla
-
-------------- from Solar Wind = 10 nanotesla
-
- Tesla is a unit of magnetic flux density. It is one Weber per meter, or one kilogram per second^2 per Ampere.
-
---------------------------- T = W * b / m^2
-
--------------------------- T = Kg * sec^2 / A
-
- --------------------------- nano = 10^-9
-
- Mercury’s atmosphere contains atoms of sodium, and calcium. Sodium may come form impacts of tiny dust grains on the surface. Iron on surface rock is around 2%. Surface has more magnesium and less aluminum than Earth, Moon , or Mars. Potassium and Chlorine is similar to Mars.
-
- Sulfur is present although it should have boiled away as a gas at Mercury’s temperatures. Almost no Oxygen was found in the rocks.
-
- Mercury’s core starts just 250 miles below the surface
-
- At the north pole water ice was discovered in the shadows of craters.
-
- To explain the dark surfaces a theory is that it could be carbon. When magma formed low-density carbon graphite was light enough to float and make a crust.
-
- No question Mercury has a strange geology
-----------
-
- Request these Reviews to learn more:
-
- 1767 - diameter of Earth is 7,927 miles
- diameter of Mercury is 2,032 miles (26%)
-
- 1706 - Mercury has virtually no atmosphere and its surface is as dark as an asphalt parking lot.
-
- 1479 - Mercury’s crust is 289 miles thick which is 19% of the planet.
-
- 1478 - mass is calculate to be 3.3 * 10^23 kilograms which is 5.5% the mass of the Earth.
-
- 1369 - average temperature is 163 C.
-
- 1343 - the Sun’s gravity is 10 times greater than on Earth.
-
- 1165 - its elliptic orbit swings from 25.5 to 43 million miles tilted at 7 degrees.
-
- 815 - until 1974 we had never seen the back side of Mercury, like not seeing the back side of the Moon.
-
- 44 - Escape velocity is 9,887 miles per hour
- Escape velocity on Earth is 25,008 miles per hour
-
- November 11, 2019 1815 2480 647
----------------------------------------------------------------------------------------
----- Comments appreciated and Pass it on to whomever is interested. ----
--- Some reviews are at: -------------- http://jdetrick.blogspot.com -----
-- email feedback, corrections, request for copies or Index of all reviews
--- to: ------ jamesdetrick@comcast.net ------ “Jim Detrick” -----------
- https://plus.google.com/u/0/ -- www.facebook.com -- www.twitter.com
--------------------- Tuesday, November 12, 2019 --------------------
-----------------------------------------------------------------------------------------
No comments:
Post a Comment