light-years

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19 08, 2017

What is Time? – Time and space in Physics

By |2018-05-31T11:49:26-07:00August 19th, 2017|Physics, When|0 Comments

Time and space: a sundial from Ukraine (ca. 1300 BC) - one of the two oldest sundials in the world Are time and space the same thing? Nobody knows what time is, or how it works. Time seems to be closely related to space, and it's possible that space and time are different ways [...]

18 08, 2017

Space – Astronomy – Physics

By |2018-05-31T11:49:23-07:00August 18th, 2017|Physics|0 Comments

Lyrid meteor shower - Space Most of the universe is just emptiness - there is nothing there at all. It's dark. That's space. But within the space there is a small amount of stuff. Most of the small amount of stuff in the universe is loose electrons. When the universe first got started, just [...]

16 08, 2017

What is a light-year? Physics definitions

By |2018-05-31T11:49:14-07:00August 16th, 2017|Physics|0 Comments

Light takes years to reach us from these stars far away in space. A light-year is the distance that light can travel in one year - that is, in the time it takes the planet Earth to make one full trip around the Sun. Light travels 186,000 miles in a second, so in [...]

18 07, 2017

Who was Archimedes? Eureka!

By |2019-02-01T06:23:28-07:00July 18th, 2017|History|0 Comments

Archimedes was from Syracuse, Sicily. Here you see it with Mount Etna in the background When did Archimedes live? Archimedes was born about 287 BC, so he was a little younger than Euclid. Archimedes' father was an astronomer, so he grew up knowing a lot about science and math. Who was Euclid? Greek astronomy History [...]

18 07, 2017

Ancient Greek astronomy

By |2019-07-23T23:51:59-07:00July 18th, 2017|Greeks, Science|0 Comments

Greek astronomy: Eclipse of the sun Astronomy before the Greeks The art of astronomy was already very advanced before the Greeks began to interest themselves in the stars. The Egyptians and especially the Mesopotamians had done a lot of scientific observations and had named the constellations of stars, and many individual stars. Early African astronomy Egyptian [...]