Space. Perspectives of Earth. Summer solstice (June 21) – the longest period of daylight; the start of summer Winter solstice (December 21) – the shortest period of daylight; the start of winter Solstices are reversed in the southern hemisphere
Stonehenge is angled such that on the equinoxes and the solstices, the sun rising over the horizon appears to be perfectly placed between gaps in the megaliths.
Black Hole: a dense remnant of a super nova; an object around which gravity is so intense even light cannot escape.
Neutron Star: If the explosion does not destroy a star, the core is left as a neutron star.
1957 – Soviet union launched the first artificial satellite called Sputnik
1960’s – Werner von Braun’s team developed the rockets that took the first U.S. astronauts into space
1962 – Canada became the third nation to launch its satellite – Alouette 1
Sputnik (the size of a basketball) and Alouette I
LANDSAT and RADARSAT follow ships at sea, monitor soil quality, track forest fires, report on environmental change and search for natural resources (not geosynchronous)
Earth-based telescopes are limited in their viewing ability by interference from moisture, clouds, air pollution and light pollution.
Triangulation based on the geometry of a triangle. Measuring the angle between the baseline and the target object allows you to determine the distance to that object.