The Prophet Daniel stated in the Book of Daniel that "knowledge would increase" during the End Times (Daniel 12:4). With the increase in technological knowledge in the last 120+ years, this prophecy has come to fruition. In Luke 21:25, the Evangelist said, "And there will be signs in the sun and moon and stars". The Indian mathematician/astronomer Brahmagupta (c/598 – c/668 AD) first described gravity as an attractive force, using the term "gurutvākarṣaṇam" to describe it within a heliocentric view of the Solar System as had been defined by Aryabhata. The existence of the gravitational constant was explored by various researchers from the mid-17th century, helping Isaac Newton formulate his law of universal gravitation. Newton's classical mechanics were superseded in the early 20th century, when Albert Einstein developed the general theory of relativity. Einstein’s theory of gravity was first put to the test when Arthur Eddington observed light “bending” around the sun during a solar eclipse. While these early scientists were instrumental in introducing the possibility of exploring space, it was Edwin Powell Hubble who paved the way for further space exploration. Today, mankind is able to see far into the deepest reaches of space thanks to the astronomical achievements of Edwin Powell, an early 20th century scientist.
While many early astronomers such as Nicolaus Copernicus, Galileo Galilei, and Johannes Kepler took a deep interest in outer space and made wonderful discoveries, it was Edwin Hubble that took that leap of scientific faith and decided to achieve what was beyond mankind's knowledge. While it was still had a couple of decades in the making, Hubble played a crucial role in inspiring the "space age" by establishing the fields of extragalactic astronomy and observational cosmology. By 1931, early rockets were being created and in 1944 Germany successfully launched the first rocket into space. In 1951, the USSR sent a pair of dogs into outer space and later, in 1957, the USSR successfully launched the first satellite into the cosmos.
On April 12, 1961, aboard the spacecraft Vostok 1, Soviet cosmonaut Yuri Alekseyevich Gagarin becomes the first human to travel into space. During the flight, the 27-year-old test pilot and industrial technician also became the first man to orbit the planet, a feat accomplished by his space capsule in 89 minutes. The next accomplishment in space came when the first humans landed on the Moon on July 20, 1969. Commander Neil Armstrong and lunar module pilot Buzz Aldren spent 21 hours and 36 minutes on the Moon's surface, while the command module pilot Michael Collins flew the Command Module Columbia alone in lunar orbit while the American astronauts were on the lunar surface.
During the early 1970s the "space race" was somewhat abandoned as the Cold War heated up. However, by 1977 America launched space probes called Voyager 1 and Voyager 2 as part of a program to study the outer solar system and interstellar space beyond the Sun's heliosphere. These unmanned probes have been successfully operating for 43 years, 8 months and 25 days as of May 31, 2021 UTC and still communicates with the Deep Space Network to receive routine commands and to transmit data to Earth. Real-time distance and velocity data is provided by NASA and JPL. At a distance of 152.2 AU from Earth as of May 31, 2021, the Voyager 2 is the most distant man-made object from Earth.