Space research is scientific study carried out in outer space, and by studying outer space. From the use of space technology to the observable universe, space research is a wide research field. Earth science, materials science, biology, medicine, and physics all apply to the space research environment. The term includes scientific payloads at any altitude from deep space to low Earth orbit, extended to include sounding rocket research in the upper atmosphere, and high-altitude balloons.
The gas giant has now become the planet with the most moons, snatching the crown from Saturn. While the ringed Saturn has 83 moons, Jupiter now has a whopping 92 lunar worlds around it
From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as 11 times brighter.
The Voyager 1 probe launched on 5 September 1977, and flew beyond the edge of our solar system in August 2012 to the interstellar medium. The farthest human object from the Earth, predictions include collision, an Oort cloud, and destiny, "perhaps eternally—to wander the Milky Way."
Voyager 2 launched on 20 August 1977 travelling slower than Voyager 1 and reached interstellar medium by the end of 2018. Voyager 2 is the only Earth probe to have visited the ice giants of Neptune or Uranus
Neither Voyager is aimed at a particular visible object, but both continue to send research data to NASA Deep Space Network as of 2019.
Two Pioneer probes and the New Horizons probe are expected to enter interstellar medium in the near future, but these three are expected to have depleted available power before then, so the point of exit cannot be confirmed precisely. Predicting probes speed is imprecise as they pass through the variable heliosphere. Pioneer 10 is roughly at the outer edge of the heliosphere in 2019. New Horizons should reach it by 2040, and Pioneer 11 by 2060.
Two Voyager probes have reached interstellar medium, and three other probes are expected to join that list.
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