Which of these is a reflector telescope?
- A convex lens is used at the end of a tube to bring an image into focus at a point
- Collects light, reflects it off a concave mirror, brought to a focus by a secondary mirror further up the tube
Why are larger telescopes reflectors rather than refractors?
- Refractors suffer from lens sagging and colour aberration
- Images look clearer in reflectors
- Cannot see so far with a reflector
Mobile Phone signals and Telecommunications can affect which of these?
- Telescope Observations
- Radio Observations
- Television Signals
Why is NOT a reason why observatories are often sited on high mountains?
- Less atmosphere to obscure viewing
- Located in areas that have good, dry weather and fewer clouds
- Built in remote locations far removed from light pollution
- The views are lovely
True or False? Earth’s atmosphere is transparent to visible light, microwaves and some radio waves.
- True
- False
True or False? X-Ray observatories are typically on-board spacecraft as are many ultraviolet and infrared observing stations.
- True
- False
What are the Van Allen belts?
- A magnetic field around Earth that traps solar particles
- An area around the Earth that can be seen from the Moon
- A trophy that Boxers fight for
Aperture is..?
- Proportional to the diameter of the objective element
- Related to the diameter of the objective element
- Focal length of the objective divided by the focal length of the eyepiece
Field of view is..?
- The amount of light that can be collected by the objective
- The circle of sky visible through the eyepiece
Radio Telescopes are..?
- Typically large to maintain resolution
- Sometimes connected to other radio telescopes in an array
- Susceptible to radio Interference
Infrared astronomy has been important in the exploration of..?
- The discovery of quasars, jets from black holes, the structure of the Milky Way and protoplanetary discs
- Protostars, dust and molecular clouds and hotspots on moons
- Gamma ray bursts, black hole accretion discs and the corona and chromosphere structure of young tars
