SKA

2. ____ are very compact stars that emit radio waves.
5. How many minutes does it take to travel from the sun to earth at the speed of light?
7. When receiving radio waves from the galaxy, radio telescopes give us a picture of the _____.
8. The huge _____ in the middle of Alpha Centauri emits radio waves.
9. How many countries are involved in the SKA project?
12. What does SKA stand for?
14. The SKA is predicted to find approximately 10 000 _____.
16. Infrared and _____ and colours that the human eye can not see.
17. What is the cause for Earth’s magnetic field?
18. Radio waves _____ off the surface of the dish and hit the receiver.
19. What is the wavelength of a hydrogen atom in cm?
20. A radio telescope converts radio waves into ______ signals.

1. Scientists theorize there is a missing component of matter in the galaxy called _______.
3. How are scientists able to measure the rotational speed of the galaxy?
4. Satellite dishes are typically made of _____ or aluminum.
6. Dark matter does not interact with other types of matter, but does have a ______ effect.
10. Scientists plan for the SKA to look for molecules that suggest life such as ____ molecules.
11. 125 000 tv aerials in western ______ point up at the sky.
13. There are 250 dishes in ______.
15. Radio waves are _____ than optical waves in length.