Practice Question 2
2.1 Compare and contrast stars, planets and satellites. Answer in about 60 words.
2.2 Identify any planet that you can see in the sky.
2.3 Name one satellite that you can see in the sky.
2.4 Why do we always see the same side of the Moon? Answer in about 40 words.
Answers
Planet and Satellites are two astronomical bodies with many fundamental differences between them
For starters, a planet is a body orbiting a star that is big enough to be rounded by its gravity, not massive to cause a thermonuclear reaction.
A satellite is an object in space that orbits or circles around a larger object. Out of this, there are two types of satellites: Natural and Artificial SatelliteDifferences between Planet and Satellite
Planet
Satellite
As per modern definitions, any astronomical body orbiting a star can be classified as a planet Satellites both natural and artificial, orbit relatively close to planets or any other celestial body with a relatively bigger mass.
The axial tilt of the planet is at an angle to the plane of their star’s equators. This causes the amount of light received in the hemisphere to vary throughout its span of rotation Satellites orbiting relatively close to the planets on uninclined circular orbits are thought to have been formed out of a collision between two astronomical bodies
The term ‘planet’ is derived from the Greek word “planan” meaning “to wander”. The term ‘satellite’ is derived from the Latin word ‘satelles’ meaning ‘to follow” or “to attend to”
Planets rotate around the invisible axes through their centers. Most of the planets in the solar system orbit the sun Natural Satellites in the Solar System are tidally locked to their respective planet, meaning that the same side of the natural satellite always faces its planet.
The huge size of the planet is responsible for the domination of the gravitational force over the electromagnetic force. This results in hydrostatic equilibrium. The mass of satellites will always be smaller from that of planets and they will be reliant upon the planet’s gravity for it to orbit.
Examples of planets are Earth, Jupiter, Saturn, etc. Examples of satellites are the Moon orbiting the Earth, Titan orbiting Saturn and Europa orbiting Jupiter
After learning about the difference between Planets and Stars, refer to the below-given links to comprehensively prepare for the Science and Technology Section of the Civil Service Exam.
Science and Technology Notes for UPSC
How to Tackle Science and Technology for UPSC
General Science Preparation for UPSC
Science and Technology MCQs for UPSC
Aspirants can find more Difference Between Articles, by visiting the linked page
Difference Between Planet and Satellite –
Become familiar with the general pattern of the IAS Exam by visiting the IAS 2020 Syllabus page. For more exam-related preparation materials, refer to the links given in the table below:
All five naked-eye planets — Mercury, Venus, Mars, Saturn and Jupiter — are appearing together in the pre-dawn sky for the first time in a decade. You need only clear skies and your bare eyes to see them; no binoculars or telescopes are required.
But the ISS isn't the only satellite to see. Of the roughly 3,000 spacecraft in Earth orbit, nearly 100 stand apart: the Iridium communications spacecraft. They periodically reflect sunlight toward the ground, causing brief but brilliant displays of light.
the moon is not stuck in place with one side facing us. Our lunar companion rotates while it orbits Earth. It’s just that the amount of time it takes the moon to complete a revolution on its axis is the same it takes to circle our planet — about 27 days. As a result, the same lunar hemisphere always faces Earth.How’d this come to be? In a word: gravity. The moon’s gravity slightly warps our planet’s shape and gives us tides. Likewise, Earth tugs at the moon, creating a rocky, high-tide “bulge” facing us. That bulge ended up working like a brake, slowing the moon’s spin down to the current rate, so the lunar high tide permanently faces us.When that happened, about 4 billion years ago, the moon became “tidally locked,” and it has presented us the same visage ever since
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Answer:
The moon moves around the earth in about 27 days.It takes exactly the same time to complete one spin.As a result, only one side of the moon is visible to us on the earth
Explanation: