What are the longest wavelengths that todays telescopes can detect for?
Probably something like lofar (10MHz = 30m)
I looked up the Lofar telescope on the web and in a slashdot comment;
it says that it is sensitive to wavelengths as long as 7 metres. Is this a mistake?
I can see that 10Mhz relates to a 30m wavelength.
Are there other telescopes in astronomy that can detect long wavelengths?
Probably the 10MHz band isn't built yet. I don't know if it's a particularly important part or just the ultimate limit of the antenna.
Generally long wavelengths haven't been much of a focus, high energy is more sexy.
Probably the most famous is the cambridge (MRAO) pulsar array.
Separate names with a comma.