... subject that we human beings only could stare at, until the development of the telescope all astronomical observations were made with the eye. By using measuring instruments, astronomers documented the positions of the planets against the background of stars. In 1609 Galileo Galilei turned his ... 12 km - 1200 farther!" (ANGULAR RESOLUTION). Scientists distinguish the angular resolution by the least angle that can be recognized in an image. The human eye with 20/20 vision, the angular resolution is 1 arc minute, which is 1/60th of a degree. The HST is 1200 times sharper, which ... to 5...

• Word Count: 3931
• Approx Pages: 16

... deg;C. This high temperature is mostly due to its atmosphere that has large amounts of carbon dioxide. Venus has no natural satellites. Venus is usually visible to the naked eye. Sometimes it is referred to as the "morning star" or the "evening star" as it is by far the brightest star in the sky. Unlike other planets ... planet in the solar system. It is the fourth planet from the Sun at a distance of 227,936,640 kilometres. It is commonly referred to as the Red planet. It was given this name by the Romans in honour of their god in war. One Mars day is 24.27 Earth hours and its year is ....

• Word Count: 677
• Approx Pages: 3
• Grade Level: High School

... the color of starlight. He believed that the wavelength of the light of a star that is moving away from us (Earth) would be lengthened which would make the light more red. The Doppler Effect does occur, but not in the way that Doppler described it. The typical velocity of a star traveling towards us is so much smaller than the velocity of ... causes a runaway green house effect and traps the heat inside. (D) Mars - When Mars is closest to Earth, it is easy to observe and can even be spotted by the naked eye. Polor caps make an obvious feature on Mars and they are very bright. Mars also ...

• Word Count: 3183
• Approx Pages: 13
• Grade Level: High School