28 Haziran 2014 Cumartesi

NEW NASA EART VİDEO ...SPACE...



Earth

Astronomical symbol of Earth
Earth
A planetary disk of white cloud formations, brown and green land masses, and dark blue oceans against a black background. The Arabian peninsula, Africa and Madagascar lie in the upper half of the disk, while Antarctica is at the bottom.
A photomosaic of Earth produced by NASA.
Orbital characteristics
Epoch J2000.0
Aphelion
152098232 km
(1.01671388 AU)
Perihelion
147098290 km
(0.98329134 AU)
Semi-major axis
149598261 km
(1.00000261 AU)
Eccentricity0.01671123
Orbital period
365.256363004 d
(1.000017421 yr)
Average orbital speed
29.78 km/s
(107200 km/h)
Mean anomaly
357.51716 deg
Inclination
  • 7.155 deg to Sun's equator;
  • 1.57869 degto invariable plane.
Longitude of ascending node
348.73936 deg
Argument of perihelion
114.20783 deg
Satellites
  • One natural satellite;
  • 1070 operational artificial satellites;
  • 21000 pieces of debris over 10 cm 
    in size (as of 24 October 2013)
Physical characteristics
Mean radius
6371.0 km
Equatorial radius
6378.1 km
Polar radius
6356.8 km
Flattening0.0033528
Circumference
  • 40075.017 km (equatorial)
  • 40007.86 km (meridional)
Surface area
  • 510072000 km2
  •  (148940000 km2 (29.2%) land
  •   361132000 km2 (70.8%) water)
Volume1.08321×1012 km3
Mass
5.97219×1024 kg
(3.0×10-6 Suns)
Mean density
5.515 g/cm
Surface gravity
9.798 m/s2
(0.9973g)
Moment of inertia factor
0.3307
Escape velocity
11.186 km/s
Sidereal rotation period
0.99726968 d
(23h 56m 4.100s)
Equatorial rotation velocity
1,674.4 km/h (465.1 m/s)
Axial tilt
23 deg 26 min 21.4119 
Albedo
  • 0.367 geometric
  • 0.306 Bond
Surface temp.minmeanmax
Kelvin184 K288 K330 K
Celsius−89.2 °C15 °C56.7 °C
Atmosphere
Surface pressure
101.325 kPa (at MSL)
Composition
  • 78.08% nitrogen (N2)[3(dry air)
  • 20.95% oxygen (O2)
  • 0.930% argon
  • 0.039% carbon dioxide
  • ~ 1% water vapor (climate-variable)
Earth, also known as "the Earth" and "the World" and sometimes referred to as the "Blue Planet", the "Blue Marble", Terra or "Gaia", is the third-closest planet to the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets and the only celestial body known to accommodate life. It is home to millions of species, including a global population of humans,that are supported and nourished by its biosphere and minerals. The human population is grouped into around two-hundred independent sovereign states that interact, among other means, through diplomacy, conflict, travel, trade and media.

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