5 Questions
Why can't sound waves travel through space?
Because there is no air in space - it is a vacuum.
At what altitude does 'outer space' begin?
About 100 km above the Earth.
What does space appear as due to the absence of air?
Space appears as a black blanket dotted with stars.
Is space completely empty?
No, even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic metre.
What types of radiation are present in space?
Infrared and ultraviolet radiation from the Sun, as well as high energy X-rays, gamma rays, and cosmic rays from distant star systems.
Study Notes
Facts about Space
- Space is a vacuum with no air, so sound waves cannot travel through it.
- 'Outer space' begins about 100 km above the Earth, where the air disappears.
- Without air to scatter sunlight, space appears as a black blanket with stars.
- Space is not completely empty; it contains thinly spread gas and dust.
- Even the emptiest parts of space have a few hundred atoms or molecules per cubic metre.
- Space is filled with various forms of radiation that are harmful to astronauts.
- Infrared and ultraviolet radiation, which can be dangerous, comes from the Sun.
- High energy X-rays, gamma rays, and cosmic rays arrive from distant star systems.
- Space is not completely silent; there are other forms of electromagnetic radiation.
- The gaps between stars and planets are vast, but not devoid of matter.
- Space is a dynamic and active environment, with constant interactions and movements.
- Understanding the properties and dangers of space is crucial for space exploration.
Test your knowledge about outer space and the unique characteristics that make it so different from Earth. Explore topics like the vacuum of space, the absence of sound, and the stunning view of the night sky. Get ready to embark on a cosmic journey and discover the wonders of the universe!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
