SKA

2. Satellite dishes are typically made of _____ or aluminum.
6. How are scientists able to measure the rotational speed of the galaxy?
9. How many minutes does it take to travel from the sun to earth at the speed of light?
13. Radio waves are _____ than optical waves in length.
14. Dark matter does not interact with other types of matter, but does have a ______ effect.
15. Infrared and _____ and colours that the human eye can not see.
16. The SKA is predicted to find approximately 10 000 _____.
17. What is the cause for Earth’s magnetic field?
20. There are 250 dishes in ______.

1. The huge _____ in the middle of Alpha Centauri emits radio waves.
3. ____ are very compact stars that emit radio waves.
4. What is the wavelength of a hydrogen atom in cm?
5. How many countries are involved in the SKA project?
7. What does SKA stand for?
8. Scientists plan for the SKA to look for molecules that suggest life such as ____ molecules.
10. Scientists theorize there is a missing component of matter in the galaxy called _______.
11. A radio telescope converts radio waves into ______ signals.
12. 125 000 tv aerials in western ______ point up at the sky.
18. Radio waves _____ off the surface of the dish and hit the receiver.
19. When receiving radio waves from the galaxy, radio telescopes give us a picture of the _____.