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  1. 4 days ago · This timeline of artificial satellites and space probes includes unmanned spacecraft including technology demonstrators, observatories, lunar probes, and interplanetary probes. First satellites from each country are included. Not included are most Earth science satellites, commercial satellites or manned missions .

  2. 2 days ago · The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga.: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, soon after the formation of the Earth's crust and the Earth itself.

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  4. 5 days ago · Development. The MAP mission was proposed to NASA in 1995, selected for definition study in 1996, and approved for development in 1997. The WMAP was preceded by two missions to observe the CMB; (i) the Soviet RELIKT-1 that reported the upper-limit measurements of CMB anisotropies, and (ii) the U.S. COBE satellite that first reported large-scale CMB fluctuations.

    • 19:46:46, June 30, 2001 (UTC)
    • 9 years, 1 month, 2 days (from launch to end collection of science data)
  5. 5 days ago · Ganymede is the largest and most massive moon in the Solar System. Its diameter of 5,268 km is 0.41 times that of Earth, 0.77 times that of Mars, 1.02 times that of Saturn's Titan (Solar System's second largest moon), 1.08 times Mercury 's, 1.09 times Callisto 's, 1.45 times Io 's and 1.51 times the Moon's. Its mass is 10% greater than Titan's ...

    • 10.880 km/s
    • 7.15455296 d
    • 8.72×10⁷ km² (0.171 Earths)
    • 1.428 m/s² (0.146 g)
  6. Sep 12, 2021 · Take a detailed look at places from above, with aerial imagery in Bing Maps

  7. 4 days ago · This is a list of government agencies engaged in activities related to outer space and space exploration . As of 2018, 72 different government space agencies are in existence; 14 of those have launch capability. Six government space agencies—the China National Space Administration (CNSA), the European Space Agency (ESA), the Indian Space ...

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