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A-level Physics A Question paper Unit 5/W - Astrophysics
... (d) Explain why the isotope of technetium, 99Tc m, is often chosen as a suitable source of radiation for use in medical diagnosis. You may be awarded additional marks to those shown in brackets for the quality of written communication in your answer. ...
... (d) Explain why the isotope of technetium, 99Tc m, is often chosen as a suitable source of radiation for use in medical diagnosis. You may be awarded additional marks to those shown in brackets for the quality of written communication in your answer. ...
PISGAH Text by Dr. Bob Hayward ASTRONOMICAL Astronomer
... centered below Leo just to the west of Jupiter and, by the next night, it will have moved to the eastern side of the giant planet. If you watch these two over this period, you will get a good feeling for just how much the moon moves each night. It takes it 27⅓ days to make a complete circle through ...
... centered below Leo just to the west of Jupiter and, by the next night, it will have moved to the eastern side of the giant planet. If you watch these two over this period, you will get a good feeling for just how much the moon moves each night. It takes it 27⅓ days to make a complete circle through ...
Winter constellations
... moment Jupiter is sitting in the constellation of Taurus, dazzlingly bright. To the lower left of Orion is the bright star Sirius, the Dog Star, which generally appears white or blue, but can take other colours when it is close to the horizon. Sirius lies in the small constellation of Canis Major, t ...
... moment Jupiter is sitting in the constellation of Taurus, dazzlingly bright. To the lower left of Orion is the bright star Sirius, the Dog Star, which generally appears white or blue, but can take other colours when it is close to the horizon. Sirius lies in the small constellation of Canis Major, t ...
Eye in the sky - Academy of Science of South Africa
... or desktops at their home institutes the morning after the observations without having to travel anywhere. ...
... or desktops at their home institutes the morning after the observations without having to travel anywhere. ...
Astronomy Facts
... The speed of light is 300000 km/sec, or (approx) 1 billion km/hour The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The bri ...
... The speed of light is 300000 km/sec, or (approx) 1 billion km/hour The sun is 1.4 million km across (110 times the earth), and over 150 million km away (500 light seconds) The largest stars (eg: Betelgeuse, Antares) are over 400 million km across (more than 300 times the diameter of the Sun) The bri ...
Chapter 15 Stars, Galaxies
... look blurry. The sky viewed from some mountaintops is clearer and is not brightened by city lights. 14. Some telescopes in space can detect ultraviolet radiation, X-rays, and gamma rays that are blocked by Earth’s atmosphere. Others can detect visible light or infrared radiation that is partially in ...
... look blurry. The sky viewed from some mountaintops is clearer and is not brightened by city lights. 14. Some telescopes in space can detect ultraviolet radiation, X-rays, and gamma rays that are blocked by Earth’s atmosphere. Others can detect visible light or infrared radiation that is partially in ...
Astrophotography
![](https://commons.wikimedia.org/wiki/Special:FilePath/Orion_Belt.jpg?width=300)
Astrophotography is a specialized type of photography for recording images of astronomical objects and large areas of the night sky. The first photograph of an astronomical object (the Moon) was taken in 1840, but it was not until the late 19th century that advances in technology allowed for detailed stellar photography. Besides being able to record the details of extended objects such as the Moon, Sun, and planets, astrophotography has the ability to image objects invisible to the human eye such as dim stars, nebulae, and galaxies. This is done by long time exposure since both film and digital cameras can accumulate and sum light photons over these long periods of time. Photography revolutionized the field of professional astronomical research, with long time exposures recording hundreds of thousands of new stars and nebulae that were invisible to the human eye, leading to specialized and ever larger optical telescopes that were essentially big cameras designed to collect light to be recorded on film. Direct astrophotography had an early role in sky surveys and star classification but over time it has given way to more sophisticated equipment and techniques designed for specific fields of scientific research, with film (and later astronomical CCD cameras) becoming just one of many forms of sensor.Astrophotography is a large sub-discipline in amateur astronomy where it is usually used to record aesthetically pleasing images, rather than for scientific research, with a whole range of equipment and techniques dedicated to the activity.