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 September 1 and 2, 1859, telegraph systems around the world failed catastrophically. The operators of the telegraphs reported receiving electrical shocks, telegraph paper catching fire, and being able to operate equipment with batteries disconnected. During the evenings, the aurora borealis, more commonly known as the northern lights, could be seen as far south as …
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 of January 2022, there are 210 confirmed moons in our solar system. A moon, also known as a natural satellite, is a celestial body that orbit planets, and asteroids. This number includes only the planetary moons. Here is the list of the known planetary moons in the solar system.
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?
Astrophotographer Andrew McCarthy published on his Twitter account an amazing video of the International Space Station (ISS) transiting the Moon, over the landing site of Apollo 11, the first moon landing mission. Such an incredible amount of human achievement is represented in just one short video!
NASA Jet Propulsion Laboratory (NASA JPL) has published a great documentary about Casini Spacecraft’s grand voyage (and its finale) around Saturn. Titled “Triumph at Saturn”, the two-part documentary chronicles the story of NASA’s Cassini mission.
Before the invention of the telescope, no one on Earth knew that Saturn had rings until the 1600s. Galileo Galilei discovered them with his telescope in 1610, but he did not know what these were either. Thus they remained a mystery until 1655 when the Dutch astronomer Christiaan Huygens (see notes 1) figured out that they …