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Vor einem Tag · It is a function of the star's luminosity, its distance from Earth, the extinction effect of interstellar dust and gas, and the altering of the star's light as it passes through Earth's atmosphere. Intrinsic or absolute magnitude is directly related to a star's luminosity, and is the apparent magnitude a star would be if the distance between the Earth and the star were 10 parsecs (32.6 light ...
Vor einem Tag · e. Renewable energy (or green energy) is energy from renewable natural resources that are replenished on a human timescale. The most widely used renewable energy types are solar energy, wind power and hydropower. Bioenergy and geothermal power are also significant in some countries. Some also consider nuclear power a renewable power source ...
Vor 3 Tagen · A full moon occurs when the side of the Moon facing Earth is fully lit up by the Sun. There are a few different types of unusual full moon types, which include blood moons, supermoons, blue moons, and harvest moons, and others. When you look up at the night sky, you might notice that the Moon looks a little different each night.
Vor 3 Tagen · Decolonization is the undoing of colonialism, the latter being the process whereby imperial nations establish and dominate foreign territories, often overseas. [1] The meanings and applications of the term are disputed. Some scholars of decolonization focus especially on independence movements in the colonies and the collapse of global colonial ...
Vor 3 Tagen · But not too simple: though the sun, moon and "fixed stars" seemed regular in their celestial circuits, the "wandering stars"—the planets—were puzzling; they seemed to move at variable speeds, and even to reverse direction. Writes Weinberg: "Much of the story of the emergence of modern science deals with the effort, extending over two millennia, to explain the peculiar motions of the planets."
Vor 3 Tagen · The eight Moon phases: 🌑 New: We cannot see the Moon when it is a new moon. 🌒 Waxing Crescent: In the Northern Hemisphere, we see the waxing crescent phase as a thin crescent of light on the right. 🌓 First Quarter: We see the first quarter phase as a half moon. 🌔 Waxing Gibbous: The waxing gibbous phase is between a half moon and ...
Vor einem Tag · Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...
