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②What+a/an+形容词+可数名词单数+主语+谓语!③What+形容词+不可数名词+主语+谓语!④What+形容词+可数名词复数+主语+谓语!“expensive(昂贵的)”为形容词,“space telescope(太空望远镜)”为可数名词单数,“expensive”是以元音音素开头的单词,所以前面要用“an”,结合选项,可知本题答案为A。
The invention comprises a primary mirror (1), a secondary mirror (2), an image field corrector (3), a focal plane (4) with at least one optical sensor, and an evaluation unit for data from the optical sensor ( 7) and a method for calibrating a space telescope in space, wherein at...
Rockets are machines that shoot objects high into the air. Learn about a rocket's purpose, and identify the four main parts of a rocket: the structure, payload, guidance portion, and propulsion system. Related to this Question How does a rocket engine work in space?
Space Exploration Image Gallery Telescopes come in all shapes and sizes, from a little plastic tube you buy at a toy store for $2, to the Hubble Space Telescope, which weighs several tons. See more space exploration pictures. Steve Cole/Getty Images Maybe you've been out looking at the...
Space Exploration Image Gallery Telescopes come in all shapes and sizes, from a little plastic tube you buy at a toy store for $2, to the Hubble Space Telescope, which weighs several tons. See more space exploration pictures. Steve Cole/Getty Images Maybe you've been out looking at the...
How does a Maksutov-Cassegrain telescope work? How does a deep space telescope work? How is optical astronomy used in space observation? How does a reflecting telescope work? How big is the Kepler Space Telescope? How does a gamma ray telescope work?
How does a star work? How do they form, live, and eventually die? Learn more about these distant objects and their major importance in the universe.
For ground-based astronomy, sky glow, caused by the reflection of municipal lights from the atmosphere, can be a major source of stray light The Sun, Earth and Moon are common unwanted external sources for an orbiting telescope Two Types of Stray Light Stray light can be characterized in tw...
How to see a lunar eclipse (Image credit: NASA/JPL-via Kieth Burns) TOP TELESCOPE PICK! (Image credit: Celestron) Looking for a telescope for a lunar eclipse? We recommend theCelestron StarSense Explorer DX 130AZas the top pick for basic astrophotography in ourbest beginner's telescope guide...