A Radar Station in Puerto Rico Can See Ice on Mercury

Radar observations of Mercury and Venus also disclose their distance from Earth too and support the accuracy of the heliocentric solar system in astronomy. On 11-Nov-19, Mercury transit across the Sun took place. Some measured the parallax of Mercury and the solar parallax using telescopes showing their distances from Earth. The astronomical unit is well defined now, supported by radar measurements of Mercury and Venus.

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