Short Answer

A satellite is an object that moves around a planet or another larger body in a fixed path called an orbit. Satellites can be natural, like the Moon, or artificial, which are man-made objects launched into space for communication, weather forecasting, navigation, and research.

Satellites stay in orbit because of a balance between their forward speed and the gravitational pull of the planet they orbit. They play a very important role in modern life by helping with TV broadcasting, GPS, internet services, and scientific observations.

Detailed Explanation :

Satellite

A satellite is any object that revolves around a planet, star, or any larger celestial body in space. Satellites can be naturally occurring, like moons, or created by humans and launched into space for specific purposes. They orbit a planet because of a perfect balance between the gravitational force pulling them inward and their forward motion pushing them outward. This delicate balance allows satellites to stay in orbit without falling to the ground or drifting away into space.

Satellites have become an essential part of modern technology and scientific exploration. They help us monitor weather, forecast storms, study space, and communicate across the world within seconds. Without satellites, many everyday conveniences like GPS, television broadcasting, and global communication would not be possible.

Natural Satellites

Natural satellites are naturally formed bodies that revolve around planets.

Examples:

• The Moon is Earth’s natural satellite.
• Mars has two natural satellites: Phobos and Deimos.
• Jupiter has more than 90 natural satellites.

Natural satellites help stabilize the planet’s rotation, affect tides, and play an important role in astronomy.

Artificial Satellites

Artificial satellites are human-made objects launched into space using rockets. They are placed in specific orbits depending on their purpose.

Types of Artificial Satellites:

1. Communication Satellites

Used for TV signals, phones, internet, and radio.

2. Weather Satellites

Help forecast weather, track storms, and study climate.

3. GPS Satellites (Navigation Satellites)

Help determine location and guide ships, planes, and vehicles.

4. Scientific Research Satellites

Used to study space, planets, stars, and Earth.

5. Military Satellites

Used for surveillance, communication, and defense.

6. Earth Observation Satellites

Used to study forests, oceans, pollution, agriculture, and natural disasters.

Artificial satellites are placed in orbits that match their job requirements.

How Satellites Stay in Orbit

Satellites stay in orbit because of a balance between:

1. Gravity

Gravity pulls the satellite toward Earth.

2. Forward Motion (Inertia)

The satellite moves forward at a very high speed.

When these two forces balance:

• The satellite keeps “falling” around Earth
• Instead of hitting Earth, it keeps missing
• This creates a stable orbit

This is similar to swinging a stone tied to a string. The inward pull keeps the stone moving in a circle. In space, gravity acts like the string.

Types of Satellite Orbits

Different satellites use different orbits:

1. Low Earth Orbit (LEO)

Altitude: 200–2000 km
Used for research, Earth observation, and the International Space Station (ISS).

2. Medium Earth Orbit (MEO)

Altitude: 2,000–35,000 km
Used for GPS satellites.

3. Geostationary Orbit (GEO)

Altitude: 35,786 km
Satellite appears fixed over one location on Earth.
Used for communication and weather satellites.

Each orbit serves different purposes depending on distance and speed.

Uses of Satellites

Satellites are extremely useful in our daily lives and scientific work:

1. Communication

Deliver TV channels, phone signals, and internet services across the world.

2. Weather Forecasting

Predict cyclones, rainfall, heat waves, and climate changes.

3. Navigation (GPS)

Provide accurate location for:

• Cars and trucks
• Ships and aircraft
• Mobile phones

4. Scientific Research

Study space, stars, Earth’s atmosphere, and the universe.

5. Disaster Management

Help detect floods, forest fires, earthquakes, and landslides.

6. Military and Defense

Used for surveillance and secure communication.

7. Agriculture

Monitor crops, soil conditions, and water levels.

Satellites support almost every field of modern technology.

Examples of Well-Known Satellites

1. Hubble Space Telescope

Provides deep space images and discoveries.

2. International Space Station (ISS)

A research laboratory orbiting Earth.

3. INSAT Series (India)

Used for communication and weather services.

4. NAVIC (India’s GPS)

Provides navigation services in India and nearby regions.

5. GSAT Series (India)

Communication satellites launched by ISRO.

How Satellites Are Launched

Satellites are launched using powerful rockets.
The rocket carries the satellite high into space and releases it at the right speed and height.
Once released, the satellite uses its onboard systems to adjust position and start operating.

Conclusion

A satellite is an object that revolves around a planet or star in a fixed orbit. Satellites can be natural, like the Moon, or artificial, created by humans for communication, research, weather monitoring, and navigation. They stay in orbit due to the balance between gravity and their forward motion. Satellites are essential in modern life, making communication, weather forecasting, navigation, and scientific discoveries possible.