Flashcards in P7.5 Deck (10):
1. Where are major optical and infrared astronomical observatories on Earth mostly situated?
-in Chile, Hawaii, Australia and the Canary Islands
2. What are factors that influence the choice of site for major astronomical observatories?
1- high elevation
=thinner atmosphere so less effects of atmosphere
2- frequent cloudless nights
=more time for observing
3- low atmospheric pollution and dry air
=less light refraction from water molecules
4- sufficient distance from built up areas that cause light pollution
=light doesn’t interfere with observations
3. What types of telescopes can astronomers work with?
3. What is a local telescope?
-nearby, can easily get to
3. What is a remote telescope?
-far away, hard to get to
4. What are the advantages of computer control of telescopes including:
1- being able to work remotely
=caves time and money
-e.g. space telescopes
2- continuous tracking of objects
=network of telescopes so can use them when it is night in that place
3- more precise positioning of the telescope
+ when doing a survey which needs lots of repositioning
4- computer recording and processing of data collected
5. What are the main advantages and disadvantages of using telescopes outside the Earth’s atmosphere?
1- avoids absorption and refraction effects of atmosphere
=light not absorbed by dist or refracted by water
2- can use parts of electromagnetic spectrum that the atmosphere absorbs
3- cost of setting up, maintaining and repairing
=have to send men up
4- uncertainties of space programme
=funding can be cut for health services, natural disasters, defence etc
=harmful as often linked programmes
6. What are the reasons for international collaboration in astronomical research?
-sharing cost, resources and expertise
7. What are two examples showing how international cooperation is essential for progress in astronomy?
International space station
=led by US
=help of 15 countries including European space agency
European extremely large telescope
=based in Chile
=help of European astronomers