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
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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.