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6. CONCLUDING REMARKS

Interstellar nanoparticles are important as emitters of near and mid IR radiation, as absorbers of far-UV radiation, as heating agents of the interstellar gas, and possibly as luminescing agents of red light. Our understanding of interstellar nanoparticles obviously remains incomplete. Besides the long-standing problems regarding the carriers of the 2175 Å extinction hump and the ERE, there are many unanswered questions which will be demanding close attention in the future:


Acknowledgements

I am extremely grateful to B.T. Draine and A.N. Witt for their invaluable advices, comments, and suggestions. I thank the anonymous referee for his/her very helpful comments and suggestions. I also thank A.N. Witt for the great efforts he has put into making the "Astrophysics of Dust Symposium" a real success.

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