James Webb Space Telescope Launch (Full HD Video)

Here is the full-HD video of the James Webb Space Telescope launch (JWST). An Ariane 5 launch vehicle (see notes 1)(Ariane Flight VA256) launched the James Webb Space Telescope from Ariane Launch Complex No. 3 (ELA 3) at Guiana Space Centre in Kourou, French Guiana, on December 25, 2021, at 12:20 UTC (09:20 local time, …

Solar Eclipse Calculator: a nice tool by NASA

Today I learned that there’s a solar eclipse calculator on the NASA website. Its official name is JavaScript Solar Eclipse Explorer (JSEX). Using this solar eclipse calculator, you can compute the local circumstances for every solar eclipse visible from a city for any century from -1499 to 3000 (1500 BCE to 3000 CE).

Blue Marble: the famous Apollo 17 photograph of Earth from space

On December 7, 1972, the crewmembers of Apollo 17 spacecraft en route to the Moon took a photo of Earth from space, at a distance of about 45,000 kilometers (28,000 miles). This image, with the official NASA designation AS17-148-22727, became known as “The Blue Marble”. It remains one of the most iconic photos of Earth …

Perućica, one of the last remaining primeval forests in Europe

Located in Republika Srpska, Bosnia and Herzegovina, Perućica is one of the last two saved primeval forests in Europe (the other being the Białowieża Forest). Perućica has many trees that are 300 years old, and its age is stated to be 20,000 years (it existed even before the last Ice Age which concluded about 11,550 …

When did we first realize that Saturn had rings

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 …