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On the night of 1612 December 27/28, Galileo sketched the positions of Jupiter’s moons, and included a background "star" which was identified in 2009 to be the planet Neptune.
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #52: ''Who Discovered Neptune?" Sale price$ 0.00
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SKY VIEW 70 70mm Refractor Telescope with Panhandle MountSKY VIEW 70 70mm Refractor Telescope with Panhandle Mount
National Geographic
SKY VIEW 70 70mm Refractor Telescope with Panhandle Mount Sale price$ 102.99
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Explore Alliance Presents: How Do You KNOW? – Episode #49: ''The Hubble Constant Mystery"
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #49: ''The Hubble Constant Mystery" Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #46: ''Mars Inside and Out"
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #46: ''Mars Inside and Out" Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #45: ''Nucleotide Bases in Asteroids"
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #45: ''Nucleotide Bases in Asteroids" Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #39: ''Exploring Martian Geology from Orbit"
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #39: ''Exploring Martian Geology from Orbit" Sale price$ 0.00
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National Geographic 4K Action Camera with WiFiNational Geographic 4K Action Camera with WiFi
National Geographic
4K Action Camera with WiFi Sale price$ 92.69
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Explore Alliance Presents: How Do You KNOW? – Episode #31: 'Hit, Run, and Return!'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #31: 'Hit, Run, and Return!' Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #29: 'Dark Matter Part 2'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #29: 'Dark Matter Part 2' Sale price$ 0.00
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Explore Scientific 1.25" Variable Polarizing FilterExplore Scientific 1.25" Variable Polarizing Filter
Explore Scientific
Explore Scientific 1.25" Variable Polarizing Filter Sale price$ 60.76
Take 15% off w/ code HOLIDAY15
Explore Alliance Presents: How Do You KNOW? – Episode #24: 'Capturing and Identifying Saturn’s Moons'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #24: 'Capturing and Identifying Saturn’s Moons' Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #22: 'The Viking Experiments'
Explore Science
Explore Alliance Presents: How Do You KNOW? – Episode #22: 'The Viking Experiments' Sale price$ 0.00
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Explore Scientific 2" Variable Polarizing FilterExplore Scientific 2" Variable Polarizing Filter
Explore Scientific
2" Variable Polarizing Filter Sale price$ 175.09
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Bresser 6x18 MonocularBresser 6x18 Monocular
Bresser
6x18 Monocular Sale price$ 20.59
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2 colors available

Bresser Deluxe Digital Camera Adapter
Bresser
Deluxe Digital Camera Adapter Sale price$ 84.41
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Condor 10x32 BinocularsCondor 10x32 Binoculars
Bresser
Condor 10x32 Binoculars Sale price$ 113.29
Take 15% off w/ code HOLIDAY15
Bresser 8x42 WD Nautic BinocularsBresser 8x42 WD Nautic Binoculars
Bresser
8x42 WD Nautic Binoculars Sale price$ 128.74
Take 15% off w/ code HOLIDAY15
Cradle for Carbon Fiber ED152mm Telescope
Explore Scientific
Cradle for David Levy Comet Hunter and TED152mm Telescope Sale price$ 154.49
Take 15% off w/ code HOLIDAY15
Explore Scientific
MD-Parts Sale price$ 1.03
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Tonka R/C Builder Kit- Using drill on the wheel screwTonka R/C Builder Kit - Junior builders can create their own job site with this three-in-one construction truck set that includes a vehicle base and swappable attachments that can be used to turn the truck into an excavator, a concrete mixer or a dump truck
Tonka
R/C Builder Kit- Assemble, Learn and Operate Sale price$ 41.19
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Sun Catcher Solar Eclipse Glasses (2,400-Pack Assortment & Counter Displays)Man looking at the sun while wearing Sun Catcher solar glasses
Explore Scientific
Sun Catcher Solar Eclipse Glasses (2,400-Pack Assortment & Counter Displays) Sale price$ 1,705.68
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Chisos 10x50 ED BinocularsChisos 10x50 ED Binoculars
Alpen
Chisos 10x50 ED Binoculars Sale price$ 298.69
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Rechargeable Lithium Battery for DWARF II Smart TelescopeRechargeable Lithium Battery for DWARF II Smart Telescope
DWARF Lab
Rechargeable Lithium Battery for DWARF II Smart Telescope Sale price$ 61.79
Explore Alliance Presents: How Do You KNOW? - Episode 58: Black Hole Collisions
Explore Scientific
Explore Alliance Presents: How Do You KNOW? - Episode 58: Black Hole Collisions Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? - Episode 57: The Fine Tuning of Nature
Explore Scientific
Explore Alliance Presents: How Do You KNOW? - Episode 57: The Fine Tuning of Nature Sale price$ 0.00
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Group Tour Option for the 2022 Mount Wilson Observatory Star Party and The Huntington LibraryGroup Tour Option for the 2022 Mount Wilson Observatory Star Party and The Huntington Library
Explore Scientific
Group Tour Option for the 2022 Mount Wilson Observatory Star Party and The Huntington Library Sale price$ 20.60
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Explore Alliance Presents: How Do You KNOW? – Episode #33: 'Three Rings of Planetary Formation'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #33: 'Three Rings of Planetary Formation' Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #32: 'Living On Mars'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #32: 'Living On Mars' Sale price$ 0.00
Take 15% off w/ code HOLIDAY15
Explore Alliance Presents: How Do You KNOW? – Episode #30: 'There is NO Debate in Science'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #30: 'There is NO Debate in Science' Sale price$ 0.00
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Explore Alliance Presents: How Do You KNOW? – Episode #27: 'Ultra Diffuse Galaxies'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #27: 'Ultra Diffuse Galaxies' Sale price$ 0.00
Take 15% off w/ code HOLIDAY15
Explore Alliance Presents: How Do You KNOW? – Episode #7: 'Magnification: Yes, you can... No, you can't!'
Explore Scientific
Explore Alliance Presents: How Do You KNOW? – Episode #7: 'Magnification: Yes, you can... No, you can't!' Sale price$ 0.00
Take 15% off w/ code HOLIDAY15
Alpen Tripod Adapter for BinocularsAlpen Tripod Adapter for Binoculars
Alpen
Tripod Adapter for Binoculars Sale price$ 15.44
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Digital Micro BowlDigital Micro Bowl
Bresser
Digital Micro Bowl Sale price$ 51.45
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Explore FirstLight 127mm Mak-Cassegrain Telescope with EXOS2GT GoTo Mount
Explore Scientific
Explore FirstLight 127mm Mak-Cassegrain Telescope with EXOS2GT GoTo Mount Sale price$ 1,029.99
Take 15% off w/ code HOLIDAY15
TDM Adapter for Losmandy G11 *Fits old and new versionTDM Adapter for Losmandy G11 *Fits old and new version
Explore Scientific
TDM Adapter for Losmandy G11 *Fits old and new version Sale price$ 432.59
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Explore Scientific
LG-Parts Sale price$ 1.03
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National Geographic Wide-View Display Weather Station with Outdoor SensorNational Geographic Wide-View Display Weather Station with Outdoor Sensor
National Geographic
Wide-View Display Weather Station with Outdoor Sensor Sale price$ 92.69
Compact BinocularsCompact Binoculars
National Geographic
Compact Binoculars Sale price$ 15.40
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Nebula Filter H-Alpha 2-inch 7nmNebula Filter H-Alpha 2-inch 7nm
Explore Scientific
Nebula Filter H-Alpha 2-inch 7nm Sale price$ 266.76
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Nebula Filter H-Alpha 1.25-inch 7nmNebula Filter H-Alpha 1.25-inch 7nm
Explore Scientific
Nebula Filter H-Alpha 1.25-inch 7nm Sale price$ 180.24
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Explore Scientific Dark-Sky Filter 77mm SlimExplore Scientific Dark-Sky Filter 77mm Slim
Explore Scientific
Dark-Sky Filter 77mm Slim Sale price$ 154.49
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OPTOLONG 1.25" L-eXtreme Deep-Sky Light Pollution FilterOPTOLONG 1.25" L-eXtreme Deep-Sky Light Pollution Filter
Optolong
1.25" L-eXtreme Deep-Sky Light Pollution Filter Sale price$ 246.17
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Explore Alliance Gift Card
Explore Alliance
Explore Alliance Gift Card Sale price$ 103.00
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Pirsch 8x34 BinocularsPirsch 8x34 Binoculars
Bresser
Pirsch 8x34 Binoculars Sale price$ 226.59
Take 15% off w/ code HOLIDAY15
Pirsch 10x34 BinocularsPirsch 10x34 Binoculars
Bresser
Pirsch 10x34 Binoculars Sale price$ 226.59
Take 15% off w/ code HOLIDAY15
Travel 12x32 BinocularsTravel 12x32 Binoculars
Bresser
Travel 12x32 Binoculars Sale price$ 37.03
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Explore Scientific / Losmandy G-11 UPGRADE with Explore Scientific PMC-Eight GoTo System - UPGRADEExplore Scientific / Losmandy G-11 UPGRADE with Explore Scientific PMC-Eight GoTo System - UPGRADE
Explore Scientific
Losmandy G-11 UPGRADE with Explore Scientific PMC-Eight GoTo System Sale price$ 1,544.99
Take 15% off w/ code HOLIDAY15
TDM Adapter for Vixen GPDX / Celestron CAM/GT5 Mounts
Explore Scientific
TDM Adapter for Vixen GPDX / Celestron CAM/GT5 Mounts Sale price$ 504.69
Take 15% off w/ code HOLIDAY15

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