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Why is it important to understand gravity?

Why is it important to understand gravity?

Gravity is very important to us. The sun’s gravity keeps Earth in orbit around it, keeping us at a comfortable distance to enjoy the sun’s light and warmth. It holds down our atmosphere and the air we need to breathe. Gravity is what holds our world together.

How does the force of gravity determine the motion of planets and satellites?

Any two masses are attracted towards each other by gravity. This force of gravity causes the Moon to change direction to make it orbit around the Earth.

What is the principle of launching a satellite?

The fundamental principle to be understood concerning satellites is that a satellite is a projectile. That is to say, a satellite is an object upon which the only force is gravity. Once launched into orbit, the only force governing the motion of a satellite is the force of gravity.

What is the velocity of satellite?

To maintain an orbit that is 22,223 miles (35,786 km) above Earth, the satellite must orbit at a speed of about 7,000 mph (11,300 kph). That orbital speed and distance permits the satellite to make one revolution in 24 hours.

Do satellites need fuel?

Satellites do carry their own fuel supply, but unlike how a car uses gas, it is not needed to maintain speed for orbit. It is reserved for changing orbit or avoiding collision with debris.

How do satellites die?

Two things can happen to old satellites: For the closer satellites, engineers will use its last bit of fuel to slow it down so it will fall out of orbit and burn up in the atmosphere. Further satellites are instead sent even farther away from Earth. That way, it will fall out of orbit and burn up in the atmosphere.

What if all satellites were destroyed?

Hundreds of millions of Internet connections would vanish, or be severely overloaded. A similar number of cell phones would be rendered useless. In remote areas, people dependent on satellite for television, Internet, and radio would practically lose all service.

Can you see satellites from Earth?

Yes, we can see satellites in particular orbits as they pass overhead at night. Viewing is best away from city lights and in cloud-free skies. It is a large object with large, highly reflective solar panels making it the brightest of human objects orbiting Earth.

Can satellites see us?

But many people want to know if these satellites can see their house, or even through their roofs and walls to the people inside. The answer is: no. Satellites differ greatly in the level of detail they can “see”.

How can you identify a satellite?

Watch the sky closely in the dawn or dusk hours, and you’ll likely see a moving “star” or two sliding by. These are satellites, or “artificial moons” placed in low Earth orbit. These shine via reflected sunlight as they pass hundreds of kilometres overhead.

Following is a transcript of the video. You’re looking at 60 satellites hurtling into the sky. And over the next few decades, Elon Musk is hoping to send 42,000 of these satellites to space, 15 times the number of operational satellites in orbit today.

Musk has said that the Starlink network would be able to provide “minor” internet coverage after 400 spacecraft were up and running, and “moderate” coverage after about 800 satellites became operational. As of late May 2021, SpaceX had launched more than 1,730 Starlink satellites overall.

Why do satellites suddenly stop being visible?

Why does the satellite suddenly stop being visible? The satellite goes into the Earth’s shadow so no sunlight is shining on it.

How can you tell the difference between a star and a satellite?

A satellite will move in a straight line and take several minutes to cross the sky. A meteor, or shooting star, will move in less than a fraction of a second across the sky. Observe the kind of light from the “star”. A satellite will brighten and dim in a regular pattern as it crosses the sky.