# How Fast Is the ISS Traveling

How Fast Is the ISS Traveling?

The International Space Station (ISS) is an incredible feat of human engineering and exploration. Orbiting the Earth at an astonishing speed, it serves as a research laboratory and living space for astronauts from different countries. In this article, we will delve into the question of how fast the ISS is traveling and explore some common questions related to its speed and trajectory.

The ISS orbits the Earth at an average speed of approximately 28,000 kilometers per hour (17,500 miles per hour). This impressive velocity allows the space station to complete one orbit around the Earth in about 90 minutes. To put this into perspective, it means that the ISS travels around the Earth roughly 16 times per day! Such a high speed is necessary to counteract the gravitational pull of our planet and maintain a stable orbit.

The ISS achieves its speed through a combination of two key factors: its altitude and the propulsion provided by its Russian-built engines. The space station orbits at an altitude of approximately 408 kilometers (253 miles) above the Earth’s surface. At this height, the ISS is able to avoid most of the Earth’s atmosphere, which would otherwise cause significant drag and slow it down.

Now, let’s move on to some common questions related to the speed of the ISS:

1. How does the ISS maintain its speed?
The ISS maintains its speed through a constant balance between the gravitational pull of the Earth and the centrifugal force generated by its high velocity.

2. Can the speed of the ISS be increased or decreased?
Yes, the speed of the ISS can be adjusted by firing its engines. This is necessary to counteract the effects of atmospheric drag and to perform maneuvers, such as changing its altitude or orientation.

3. What happens if the ISS slows down too much?
If the ISS slows down too much, it would lose the centrifugal force needed to counteract the Earth’s gravity. This would cause the space station to spiral towards the Earth and eventually burn up in the atmosphere.

4. Is the speed of the ISS constant throughout its orbit?
No, the speed of the ISS varies slightly throughout its orbit. It is fastest when it is closest to the Earth (perigee) and slows down slightly as it moves away (apogee).

5. How does the speed of the ISS compare to the speed of a commercial jet?
The average cruising speed of a commercial jet is around 900 kilometers per hour (560 miles per hour), while the ISS travels at approximately 28,000 kilometers per hour (17,500 miles per hour). Therefore, the ISS is much faster than a commercial jet.

6. Can the speed of the ISS be measured from Earth?
Yes, the speed of the ISS can be measured from Earth using radar systems that track its position. These measurements allow scientists to monitor its orbit and make necessary adjustments.

7. How long does it take for the ISS to complete one full orbit?
The ISS takes approximately 90 minutes to complete one full orbit around the Earth.

8. Does the speed of the ISS affect time on board?
Yes, the high speed of the ISS causes time to pass slightly slower for the astronauts on board compared to people on Earth, due to the effects of time dilation predicted by Einstein’s theory of relativity.

9. How does the speed of the ISS affect the aging process of astronauts?
The high speed of the ISS affects the aging process of astronauts by slowing it down slightly, again due to the effects of time dilation.

10. Can the speed of the ISS be increased to reach other celestial bodies?
No, the speed of the ISS is not sufficient to reach other celestial bodies within our solar system. Additional propulsion systems and trajectories are required for interplanetary travel.