{"id":1130,"date":"2010-01-05T11:45:00","date_gmt":"2010-01-05T19:45:00","guid":{"rendered":"http:\/\/new.creationbc.org\/?p=1130"},"modified":"2021-10-06T22:22:11","modified_gmt":"2021-10-07T05:22:11","slug":"planet-earth-a-well-designed-place-to-live","status":"publish","type":"post","link":"https:\/\/creationbc.org\/index.php\/planet-earth-a-well-designed-place-to-live\/","title":{"rendered":"Planet Earth \u2014 A Well-Designed Place to Live!"},"content":{"rendered":"
by Richard Peachey<\/em><\/span><\/h6>\n

“<\/span>The highest heavens belong to the LORD<\/span>, but the earth he has given to men.<\/span><\/strong>” (Psalm 115:16)<\/span><\/p>\n

“<\/span>In the 15 years since the discovery of the first planet around a star other than our Sun, we have found more than 400 such exoplanets \u2014 but there is still no place like home.<\/strong><\/span>” \u2014 Debra Fischer (Yale University astronomy professor). 2010 (Apr 29). “Signatures of life on other worlds.” Nature<\/em> 464:1276.<\/span><\/p>\n

“. . . the NASA spacecraft Kepler, which watches for a dimming in a star\u2019s light as a planet crosses its face . . . was launched in 2009, and data from its first two years of operation have revealed about 3,000 candidate exoplanets. . . .<\/span> Surprisingly, the cumulative data set does not contain a single Earth-sized planet at a habitable distance from its star<\/strong><\/span> . . . .” \u2014 Eric Hand. 2012 (Oct 18). “The exoplanet next door: Earth-sized world discovered in nearby \u03b1<\/span> Centauri star system.” Nature<\/em> 490:323.<\/span><\/p>\n

\u2022 Earth has a large supply of water, and our optimum distance from the Sun allows the water to exist in three forms \u2014 vapour, liquid, and ice. (Other planets have virtually no liquid water.)<\/span><\/p>\n

\u2022 The two major constituents of our atmosphere, oxygen (21%) and nitrogen (78%) are balanced to make up the ideal medium for the support of life.<\/span><\/p>\n

\u2022 Water vapour and carbon dioxide in our atmosphere produce a “greenhouse effect” moderating temperature extremes and allowing survival of a variety of life forms.<\/span><\/p>\n

\u2022 The nearly circular orbit of Earth and its relatively short period of rotation also limit temperature variations.<\/span><\/p>\n

\u2022 Earth is provided with multiple safety shields to screen out the harmful components of the Sun’s radiation. In addition to our distance from the Sun, shielding factors include the Earth’s magnetic field and atmosphere, in particular the ozone layer.<\/span><\/p>\n

\u2022 Elements essential to life (e.g., carbon, nitrogen, oxygen, phosphorus) are found in Earth’s crust, hydrosphere, and atmosphere in quantities much greater than the average abundance observed in other parts of the universe.<\/span><\/p>\n

\u2022 The inclination of Earth’s axis of rotation (tilted 23.5\u00b0 from a line perpendicular to the plane of Earth’s orbit) provides for the seasons, permits all places on Earth to receive sunlight regularly, and probably prevents the locking of excessive amounts of water in polar glaciers.<\/span><\/p>\n

\u2022 Our Moon’s gravitation produces important tidal circulation effects in the oceans, making conditions much more suitable for sea life in the shallow zones along shores and in estuaries. The Moon’s size is adequate (larger than most moons compared to their planets), and the Earth-Moon distance is small enough (unlike that of many moons from their planets) to produce tides of appropriate size, and to provide a good-sized night light.<\/span><\/p>\n

As for other planets within our solar system<\/span><\/strong>: \u2014 None of them have any liquid water or atmospheric oxygen to speak of.<\/span><\/p>\n

The surfaces of Mercury<\/em> and Venus<\/em> are hot enough to melt lead. Mercury is heavily cratered and has virtually no atmosphere. Venus’s atmosphere is mostly poisonous carbon dioxide, with clouds made of sulfuric acid droplets.<\/span><\/p>\n

Mars<\/em> has only a thin atmosphere of carbon dioxide, nitrogen, and argon.<\/span><\/p>\n

The gas giants Jupiter<\/em>, Saturn<\/em>, Uranus<\/em>, and Neptune<\/em> all have very low temperatures, accompanied by intense storms of radiation and magnetism; their atmospheres consist of hydrogen, helium, and methane.<\/span><\/p>\n

Be it ever so humble \u2014 there’s no place like home! <\/em><\/span><\/p>\n

\"\"<\/p>\n

\n

“Rare Earth Factors”<\/span><\/span><\/h3>\n

The late astronomer and popularizer of science, Carl Sagan, described planet Earth as an unremarkable “pale blue dot” floating in the vastness of space. He suggested there might well be billions of planets suitable for life, even within our own galaxy. But more recently, two scientists have presented a case that, in light of the known evidence, our planet is very special. Peter Ward, an evolutionary geologist, and Donald Brownlee, an evolutionary astronomer, both at the University of Washington, have written a book titled Rare Earth: Why Complex Life is Uncommon in the Universe<\/em> (2000. New York: Copernicus [Springer-Verlag]). This book argues that a variety of factors make the Earth “rare” as a home for complex life \u2014 in particular, animal life. For example:<\/span><\/p>\n

– right position in galaxy (not near the centre with its high star density, dangerous supernovae, and lethal radiation)<\/span><\/p>\n

– right mass of star (not too much ultraviolet radiation)<\/span><\/p>\n

– right distance from star (temperatures suitable for life)<\/span><\/p>\n

– solar system has stable planetary orbits (giant planets do not create orbital chaos)<\/span><\/p>\n

– Jupiter-like neighbour at right distance, to clear out comets and asteroids<\/span><\/p>\n

– large supply of liquid water near planet’s surface<\/span><\/p>\n

– right kind of ocean, in terms of pH, salinity, temperature, and volume<\/span><\/p>\n

– right atmospheric properties (to maintain adequate temperature, composition, and pressure for plants and animals)<\/span><\/p>\n

– right planetary mass to retain atmosphere and ocean<\/span><\/p>\n

– right amount of carbon to sustain life<\/span><\/p>\n

– right tilt (seasons not too severe)<\/span><\/p>\n

– large moon at right distance; stabilizes tilt<\/span><\/p>\n

\n

Note<\/strong><\/span>: Both of the Rare Earth<\/em> authors accept macroevolution, and a few of the “factors” quoted in their book reflect this frame of reference<\/strong> (their summary, presented on pages xxvii-xxviii of the book, is shown below). Most of their points, however, are acceptable from anyone’s point of view.<\/span><\/p>\n\n\n\n\n\n\n\n\n
Right distance from star<\/strong><\/span>
\nHabitat for complex life.<\/span>
\nLiquid water near surface<\/span>
\nFar enough to avoid tidal<\/span>
\nlock.<\/span><\/td>\n		 <\/p>\n

Right mass of star<\/strong><\/span>
\nLong enough lifetime.<\/span>
\nNot too much ultraviolet.<\/span><\/p>\n

 <\/span><\/td>\n

 <\/p>\n

Stable planetary orbits<\/strong><\/span>
\nGiant planets do not<\/span>
\ncreate orbital chaos.<\/span><\/p>\n

 <\/span><\/td>\n<\/tr>\n

Right planetary mass<\/strong><\/span>
\nRetain atmosphere and<\/span>
\nocean. Enough heat for<\/span>
\n plate tectonics.<\/span>
\nSolid\/molten core.<\/span><\/td>\n		Jupiter-like neighbor<\/strong><\/span>
\nClear out comets and<\/span>
\nasteroids. Not too close,<\/span>
\nnot too far.<\/span><\/td>\n		A Mars<\/strong><\/span>
\nSmall neighbor as<\/span>
\npossible life source to <\/span>
\nseed Earth-like planet<\/span>
\nif needed.<\/span><\/td>\n<\/tr>\n
Plate tectonics<\/strong><\/span>
\nCO2<\/sub><\/span>-silicate thermostat.<\/span>
\nBuild up land mass.<\/span>
\nEnhance biotic diversity.<\/span>
\nEnable magnetic field.<\/span><\/td>\n		 <\/p>\n

Ocean<\/strong><\/span>
\nNot too much. <\/sub><\/span><\/span>
\nNot too little.<\/span><\/p>\n

 <\/span><\/td>\n

 <\/p>\n

Large Moon<\/strong><\/span>
\nRight distance. <\/sub><\/span><\/span>
\nStabilizes tilt.<\/span><\/p>\n

 <\/span><\/td>\n<\/tr>\n

The right tilt<\/strong><\/span>
\nSeasons not too severe.<\/span><\/td>\n		Giant impacts<\/strong><\/span>
\nFew giant impacts.<\/span>
\nNo global sterilizing<\/span>
\nimpacts after an initial<\/span>
\nperiod.<\/span><\/td>\n		The right amount
\nof carbon<\/strong><\/span>
\nEnough for life.<\/span>
\nNot enough for<\/span>
\nRunaway Greenhouse<\/span><\/td>\n<\/tr>\n
Atmospheric properties<\/strong><\/span>
\nMaintenance of adequate<\/span>
\ntemperature, composition<\/span>
\nand pressure for plants<\/span>
\n and animals.<\/span><\/td>\n		Biological evolution<\/strong><\/span>
\nSuccessful evolutionary<\/span>
\npathway to complex<\/span>
\nplants and animals<\/span><\/td>\n		Evolution of oxygen<\/strong><\/span>
\nInvention of photo-<\/span>
\nsynthesis. Not too much<\/span>
\nor too little. Evolves at<\/span>
\nthe right time.<\/span><\/td>\n<\/tr>\n
Right kind of galaxy<\/strong><\/span>
\nEnough heavy elements.<\/span>
\nNot small, elliptical, or<\/span>
\nirregular.<\/span><\/td>\n		Right position in galaxy<\/strong><\/span>
\nNot in center, edge<\/span>
\nor halo.<\/span><\/td>\n		Wild cards<\/strong><\/span>
\nSnowball Earth. Cambrian<\/span>
\nexplosion. Inertial<\/span>
\ninterchange event.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

by Richard Peachey “The highest heavens belong to the LORD, but the earth he has given to men.” (Psalm 115:16) “In the 15 years since the discovery of the first planet around a star other than our Sun, we have found more than 400 such exoplanets \u2014 but there is still no place like home.” \u2014 Debra Fischer (Yale University astronomy professor). 2010 (Apr 29). “Signatures of life on other worlds.” Nature 464:1276. “. . . the NASA spacecraft Kepler, which watches for a dimming in a star\u2019s light as a planet crosses its face . . . was launched in 2009, and data from its first two years of operation have revealed about 3,000 candidate exoplanets. . . . Surprisingly, the cumulative data set does not contain a single Earth-sized planet at a habitable distance from its star . . . .” \u2014 Eric Hand. 2012 (Oct 18). “The exoplanet next door: Earth-sized world discovered in nearby \u03b1 Centauri star system.” Nature 490:323. \u2022 Earth has a large supply of water, and our optimum distance from the Sun allows the water to exist in three forms \u2014 vapour, liquid, and ice. (Other planets have virtually no liquid water.) \u2022 The two major constituents of our atmosphere, oxygen (21%) and nitrogen (78%) are balanced to make up the ideal medium for the support of life. \u2022 Water vapour and carbon dioxide in our atmosphere produce a “greenhouse effect” moderating temperature extremes and allowing survival of a variety of life forms. \u2022 The nearly circular orbit of Earth and its relatively short period of rotation also limit temperature variations. \u2022 Earth is provided with multiple safety shields to screen out the harmful components of the Sun’s radiation. In addition to our distance from the Sun, shielding factors include the Earth’s magnetic field and atmosphere, in particular the ozone layer. \u2022 Elements essential to life (e.g., carbon, nitrogen, oxygen, phosphorus) are found in Earth’s crust, hydrosphere, and atmosphere in quantities much greater than the average abundance observed in other parts of the universe. \u2022 The inclination of Earth’s axis of rotation (tilted 23.5\u00b0 from a line perpendicular to the plane of Earth’s orbit) provides for the seasons, permits all places on Earth to receive sunlight regularly, and probably prevents the locking of excessive amounts of water in polar glaciers. \u2022 Our Moon’s gravitation produces important tidal circulation effects in the oceans, making conditions much more suitable for sea life in the shallow zones along shores and in estuaries. The Moon’s size is adequate (larger than most moons compared to their planets), and the Earth-Moon distance is small enough (unlike that of many moons from their planets) to produce tides of appropriate size, and to provide a good-sized night light. As for other planets within our solar system: \u2014 None of them have any liquid water or atmospheric oxygen to speak of. The surfaces of Mercury and Venus are hot enough to melt lead. Mercury is heavily cratered and has virtually no atmosphere. Venus’s atmosphere is mostly poisonous carbon dioxide, with clouds made of sulfuric acid droplets. Mars has only a thin atmosphere of carbon […]<\/p>\n","protected":false},"author":2,"featured_media":1131,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113,303,290,8],"tags":[],"class_list":["post-1130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-astronomy","category-science","category-scientific"],"_links":{"self":[{"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/posts\/1130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/comments?post=1130"}],"version-history":[{"count":6,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/posts\/1130\/revisions"}],"predecessor-version":[{"id":8037,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/posts\/1130\/revisions\/8037"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/media\/1131"}],"wp:attachment":[{"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/media?parent=1130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/categories?post=1130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/creationbc.org\/index.php\/wp-json\/wp\/v2\/tags?post=1130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}