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seen Jul 5 '13 at 20:15

Jun
3
accepted Ways of verifying the origin of a meteorite?
Jun
3
asked Ways of verifying the origin of a meteorite?
Jun
3
accepted Can any telescope be used for solar observing?
Jun
2
comment Can any telescope be used for solar observing?
Thanks, the link is helpful and excellent point about covering the full aperture.
Jun
2
comment Can any telescope be used for solar observing?
Thank you. Didn't know an H-alpha filter cost so much. With a Mylar filter, would a prominence not be visible or just not as clear?
Jun
2
asked Can any telescope be used for solar observing?
Jun
2
answered How can a black hole emit X-rays?
Dec
24
awarded  Supporter