On May 29, 1919, Einstein’s General Theory of Relativity, which was just four-year-old at the time, was put to its first test during a total solar eclipse. Albert Einstein’s prediction of the bending of light by the gravity of the Sun, one of the components of his general theory of relativity, could be tested by …
On May 19, 1910, the Earth passed through the tail of Halley’s Comet. Prior to the date, using spectroscopy, astronomers detected cyanogen, a very deadly poison in the comet’s tail. This caused panic. French astronomer Camille Flammarion (26 February 1842 – 3 June 1925) even claimed that life on Earth would end because of this.
On May 1, 1949, Neptune’s Moon Nereid was discovered by the Dutch astronomer and planetary scientist Gerard Kuiper, who is the eponymous namesake of the Kuiper belt. Nereid is also named Neptune II because it is the second moon of Neptune to be discovered. It is also the last satellite of Neptune to be discovered …
On April 11, 1986, with about 63 million kilometers (39 million miles), Halley’s Comet made its closest approach to Earth on its outbound journey (while moving away from the Sun).
On March 26, 1994, a photo was released showing the first moon discovered be in orbit around an asteroid, 243 Ida. Today’s (March 26) story of what happened this day in Science, Technology, Astronomy, and Space Exploration history.
On March 25, 1655, the Dutch mathematician, physicist, astronomer, and inventor Christiaan Huygens discovered Titan, Saturn’s largest moon and the second-largest natural satellite in the Solar System (after Jupiter’s Ganymede). Today’s (March 25) story of what happened this day in Science, Technology, Astronomy, and Space Exploration history.
On March 21, 1864, the Italian mathematician, astronomer, and engineer Giovanni Domenico Cassini (8 June 1625 – 14 September 1712) discovered Saturn’s moons Tethys and Dione. Cassini used a refractor telescope with an aperture of 108 mm to make this observation. Today’s (March 21) story of what happened this day in Science, Technology, Astronomy, and Space …
On March 13, 1986, European Space Agency‘s (ESA) Giotto spacecraft made the closest approach to Halley’s Comet at a distance of 596 kilometers (370 miles). Today’s (March 13) story of what happened this day in Science, Technology, Astronomy, and Space Exploration history.
Earth’s phases in the Moon’s sky are exactly the opposite of the Moon’s phases in the Earth’s sky. Is there a full moon? The Earth is dark in the Moon’s sky. It’s half-moon? The Earth is also half. Moon is a slim crescent? Earth is almost full.
As NASA plans to return to the moon, will we be able to see the astronauts on the Moon via a really strong telescope, when they were landed?