General knowledgeAsked by Anonymous23 Oct 2026, 1:24 PM ISTUpdated
In one line
Satellites in space mostly get their power from the Sun using solar panels.
Solar panel — Assembly of photovoltaic cells used to generate electricity Solar panels like these are used on satellites to turn sunlight into electricity. Image: WikipediaInternational Space Station — Modular space station in low Earth orbit The International Space Station with its large solar panels, showing how satellites use sunlight for power. Image: Wikipedia
The rule
Satellites use solar energy, stored batteries, or sometimes fuel cells to power their systems in space.
Let's understand it simply
Imagine your mobile phone. It needs a battery to work. But what if you could not plug it in to charge? Satellites are like phones flying high above Earth. They cannot plug into anything in space. So, they use sunlight. Special plates called solar panels catch sunlight and turn it into electricity. This electricity runs all the machines inside the satellite.
How it works
The satellite opens its solar panels to face the Sun.
Sunlight hits the panels, which are made of special materials (like silicon).
The panels change sunlight into electricity (solar energy).
This electricity powers the satellite’s computers, cameras, and antennas.
Extra electricity is stored in batteries for when the satellite is in Earth's shadow (night side).
How satellites get power from the Sun
Solar panels open and face the Sun
Sunlight hits the panels
Panels turn sunlight into electricity
Electricity powers the satellite's systems
Extra power is stored in batteries
The story behind it
The first artificial satellite, Sputnik 1 (1957), used batteries for power. But batteries run out quickly. Soon after, scientists added solar panels to satellites. This let them work for years, not just days. Solar panels became the main way to power satellites, thanks to the endless sunlight in space.
Where you see it in real life
ISRO satellites: Indian satellites like GSAT and Cartosat use solar panels to work for years.
International Space Station (ISS): It has huge solar panels to power all its systems.
Weather satellites: They use solar energy to send weather updates to Earth.
GPS satellites: Solar panels keep them running so your phone can find your location.
Communication satellites: Solar power lets you watch TV and use the internet from far away places.
Why it matters
Without power, satellites cannot send signals or take pictures.
Solar panels make satellites last much longer in space.
Saves money—no need to send fuel or change batteries.
Many space missions (to Mars, Moon) depend on solar power for success.
Common mistakes
Thinking satellites use petrol or diesel—there is no fuel station in space!
Believing satellites work only with batteries—batteries are just backup for when there is no sunlight.
Forgetting that satellites need to turn their panels to face the Sun for best power.
Remember it
Satellites are like big calculators in space—they run on sunlight, not petrol!
Check yourself
What is the main source of power for most satellites?
Solar panels using sunlight.
Why do satellites need batteries if they have solar panels?
To store energy for times when the satellite is in Earth's shadow and sunlight is blocked.
Why can't satellites use petrol or diesel for power?
There are no fuel stations in space, and carrying fuel is heavy and expensive.
Why do satellites turn their solar panels to face the Sun?
To get the most sunlight and make the most electricity.
Quick recap
Satellites use solar panels to get power from sunlight.
Batteries store extra energy for when there is no sunlight.
Solar power lets satellites work for many years.
No petrol or diesel is used in space for satellites.
