What is the difference between manmade and natural satellites

The friction due to the Earth's atmosphere heats it up. On heating up, it emits light and glows producing a bright streak of light. Since they get evaporated quickly, the bright streaks lasts only for a short duration of time. Mercury and Venus are the two planets that can be seen as morning and evening star in the sky.

Mercury being the closest to the Sun is hidden in the glare of the sun and is rarely visible. However, it can be observed just before the sunrise or after the sunset near the horizon. Venus appears in the eastern sky before sunrise and appears in the western sky after the sunset.

Due to their visibilty before sunrise and after sunset, they are called evening and morning star. Also, Mercury and Venus lie inside the orbit of the earth. The ancient people found the night sky to be very useful to find the direction.

The position of pole star remained fixed in the north sky and it indicated North direction. As the stars change their position with time, it has been possible to find the time with relative position of stars. Chapter Chosen stars and solar system.

Book Chosen science. However, this motion is apparent and not true. The Moon is in fact orbiting the Earth in a west to east direction. The Earth rotates once each day, and the Moon orbits the Earth once every The distance moved by the Moon in 1 day can be observed by comparing its position in the sky at one time with its new position exactly 24 hours later.

He was limited by the quality and power of the telescopes available to him at the time. Nowadays with far more powerful and high-quality telescopes, we can see further and with more detail. Gains in scientific knowledge and understanding are often connected to technological advances in the equipment used to aid our powers of observation. Visit the Stardome Observatory and Planetarium website for resources and activities about comets. Add to collection. Go to full glossary Add 0 items to collection.

Download 0 items. Twitter Pinterest Facebook Instagram. Email Us. The artificial satellites are man-made. The first artificial satellite was Sputnik I. The artificial satellites are objects humans propel through the earth's atmosphere in order to orbit around the earth.

The electrical power required by satellite is provided by panels of solar cells and small nuclear reactors. These are used and controlled by the astronomers and are used to upto their will. The artificial satellite is made out of metal and electronics material. The artificial satellites don't have the advantage like natural satellites which are normally massive enough to stay in orbit indefinitely. The artificial planet can communicate with instruments on earth.

Artificial satellites have many uses, including relaying communication signals, making accurate surveys and inventories of the earth's surface and weather patterns, and carrying out scientific experiments.

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