9781422276013

WORDS TO UNDERSTAND

active satellite a satellite that can transmit a signal on its own arouse to develop interest in something asteroid a small body that revolves around the sun but is smaller than a planet astronomy the science of studying the objects in the sky and the universe crater a large depression present on the surface eject to give out or throw outwards electromagnetic wave a wave carrying high energy such as X-ray, microwave, etc. external present on the outer region or outer side fascination having great interest and curiosity for something inner planets the four planets of the Solar System, namely, Mercury, Venus, earth, and Mars interplanetary something that is related to any planet other than the earth lander a large, immobile space equipment that lands on the sur- face of a planet or other heavenly body launchpad a platform from which a missile, rocket, or space shuttle is launched magnetic field region around a magnet that has the ability to attract charged particles magnetosphere a circular region outside a planet where its magnetic field is active

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SCIENCE & TECHNOLOGY