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Ultra-diffuse galaxies are generally quenched dwarf galaxies with no gas reservoirs, they are therefore unable to form new stars; as a result, ...

Features Flashlight mode has a low beam option that illuminates up to 40 meters and a high beam option that reaches up to 100 meters Floodlight m...

The universe has always been mysterious and strange to us, but in fact it may be stranger than we can ever fathom. In this episode of How Do You...

Features Detect coins, jewelry and other metal objects up to 6 inches below the surface LCD display and audio tones alert searchers to presence ...

Features Dark-Sky filter Contrast increase in aurora & deep-sky photography Reduction of stray light from street lights, for example Wide-ang...

In the second part of Dr. Barth's discussion on dark matter, he touches on why did galaxies form, the missing matter problem, and the Great Attr...

In this episode, Dr. Barth discusses the the difference between persuading someone to accept your opinion in an argument and arguing from eviden...

Features High quality Explore Scientific O-III filter Let only the oxygen emission lines "through" Absorbs all other emission lines Absorbs almo...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

The creation of Earth's Moon is an age old question. There are pre-Apollo mission theories, of which three of the most popular ones will be d...

Get the National Geographic Carbon Trekking Poles Set for FREE, when purchasing 10x42 Waterproof Performance Roof Binoculars. To activate this pro...

It's estimated that we will colonize Mars by 2050. The challenges to make it happen are daunting.  Dr. Barth touches on some of the problems tha...

Features 4K HD Camera Waterproof Case Flat Adhesive Mounts Handle Bar/Pole Mount Frame Housing Mount Straps Long Thumb Screw Quick Release Buckle...

Dr. Daniel Barth returns with the 33rd episode of 'How Do You KNOW?' to discuss the Three Ring Theory that explains the formation of our solar s...

Features Combination of fully multi-coated lenses and superior Bak-4 prisms creates images with excellent contrast and clarity 42mm aperture has ...

Features Combination of fully multi-coated lenses and superior Bak-4 prisms creates images with excellent contrast and clarity 42mm aperture has ...