April 1: The METI message Cosmic Call 2 sent from the 70-meter Eupatoria Planetary Radar on July 6, 2003 will arrive at its destination, HIP 4872.
April 13: According to estimates made in 2013, the asteroid99942 Apophis will pass at least 14 million miles (23 million km) from the Earth, most likely by around 35 million miles (56 million km)
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This is the latest that the Voyager 1 and Voyager 2 spacecrafts will be within the range of the Deep Space Network, according to NASA.