??????

Classroom Aid - Omega Nebula
00:01:00
Classroom Aid - Omega Nebula
admin | 70 ?????????
Classroom Aid - Little Ghost Nebula and NGC 2440
00:00:49
Classroom Aid - Little Ghost Nebula and NGC 2440
admin | 151 ?????????
Classroom Aid - Zwicky Sees First Light
00:01:00
Classroom Aid - Zwicky Sees First Light
admin | 93 ?????????
Classroom Aid - Fornax Dwarf Galaxy
00:00:36
Classroom Aid - Fornax Dwarf Galaxy
admin | 39 ?????????
Classroom Aid - Planetary Formation Theory Intro
00:01:38
Classroom Aid - Planetary Formation Theory Intro
admin | 63 ?????????
Classroom Aid - NGC 7049
00:00:23
Classroom Aid - NGC 7049
admin | 61 ?????????
Classroom Aid - Hanny's Voorwerp
00:01:05
Classroom Aid - Hanny's Voorwerp
admin | 109 ?????????
Classroom Aid - Isotope Dilution
00:01:00
Classroom Aid - Isotope Dilution
admin | 75 ?????????
Classroom Aid - NGC 4522
00:00:43
Classroom Aid - NGC 4522
admin | 101 ?????????
Classroom Aid - NGC 5548 Black Hole
00:01:20
Classroom Aid - NGC 5548 Black Hole
admin | 8 ?????????
Classroom Aid - Star Eta Carinae
00:00:30
Classroom Aid - Star Eta Carinae
admin | 11 ?????????
Classroom Aid - Local Group Conclusion
00:00:22
Classroom Aid - Local Group Conclusion
admin | 8 ?????????
Classroom Aid - Distant Stars Introduction
00:00:58
Classroom Aid - Distant Stars Introduction
admin | 11 ?????????
Classroom Aid - Iris Nebula NGC 7023
00:00:59
Classroom Aid - Iris Nebula NGC 7023
admin | 10 ?????????
Classroom Aid - Hipparcos
00:00:54
Classroom Aid - Hipparcos
admin | 23 ?????????
Classroom Aid - 'How far away is it' preview
00:01:22
Classroom Aid - 'How far away is it' preview
admin | 13 ?????????
Classroom Aid - NGC 6503
00:00:34
Classroom Aid - NGC 6503
admin | 8 ?????????
Classroom Aid - 01 - Galaxy Walls and Voids
00:01:45
Classroom Aid - 01 - Galaxy Walls and Voids
admin | 10 ?????????
Classroom Aid - Electrons and Protons
00:01:38
Classroom Aid - Electrons and Protons
admin | 10 ?????????

Classroom Aid - Cosmic Distance and Visible Horizon

5 ?????????
admin
admin
0
???? ?? 30 Sep 2020 / ?? علم

Text at http://howfarawayisit.com/documents/

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0 ??????? sort ????? ???

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Classroom Aid - Omega Nebula
00:01:00
Classroom Aid - Omega Nebula
admin | 70 ?????????
Classroom Aid - Little Ghost Nebula and NGC 2440
00:00:49
Classroom Aid - Little Ghost Nebula and NGC 2440
admin | 151 ?????????
Classroom Aid - Zwicky Sees First Light
00:01:00
Classroom Aid - Zwicky Sees First Light
admin | 93 ?????????
Classroom Aid - Fornax Dwarf Galaxy
00:00:36
Classroom Aid - Fornax Dwarf Galaxy
admin | 39 ?????????
Classroom Aid - Planetary Formation Theory Intro
00:01:38
Classroom Aid - Planetary Formation Theory Intro
admin | 63 ?????????
Classroom Aid - NGC 7049
00:00:23
Classroom Aid - NGC 7049
admin | 61 ?????????
Classroom Aid - Hanny's Voorwerp
00:01:05
Classroom Aid - Hanny's Voorwerp
admin | 109 ?????????
Classroom Aid - Isotope Dilution
00:01:00
Classroom Aid - Isotope Dilution
admin | 75 ?????????
Classroom Aid - NGC 4522
00:00:43
Classroom Aid - NGC 4522
admin | 101 ?????????
Classroom Aid - NGC 5548 Black Hole
00:01:20
Classroom Aid - NGC 5548 Black Hole
admin | 8 ?????????
Classroom Aid - Star Eta Carinae
00:00:30
Classroom Aid - Star Eta Carinae
admin | 11 ?????????
Classroom Aid - Local Group Conclusion
00:00:22
Classroom Aid - Local Group Conclusion
admin | 8 ?????????
Classroom Aid - Distant Stars Introduction
00:00:58
Classroom Aid - Distant Stars Introduction
admin | 11 ?????????
Classroom Aid - Iris Nebula NGC 7023
00:00:59
Classroom Aid - Iris Nebula NGC 7023
admin | 10 ?????????
Classroom Aid - Hipparcos
00:00:54
Classroom Aid - Hipparcos
admin | 23 ?????????
Classroom Aid - 'How far away is it' preview
00:01:22
Classroom Aid - 'How far away is it' preview
admin | 13 ?????????
Classroom Aid - NGC 6503
00:00:34
Classroom Aid - NGC 6503
admin | 8 ?????????
Classroom Aid - 01 - Galaxy Walls and Voids
00:01:45
Classroom Aid - 01 - Galaxy Walls and Voids
admin | 10 ?????????
Classroom Aid - Electrons and Protons
00:01:38
Classroom Aid - Electrons and Protons
admin | 10 ?????????