How big is the universe? (video)

February 27, 2013 9:11 AM Sean Ludwig
Sean Ludwig

You can’t just take out a telescope and easily figure it out, but thankfully popular YouTube channel Minute Physics has just released a new video about the size of space.

Why is the night sky dark when there are so many stars & galaxies? (video)

September 30, 2012 3:54 PM Sean Ludwig
Sean Ludwig

Why is the night sky dark? "Because the sun isn't up!" But wait -- if the universe is chock full of stars just like our sun, why isn't it bright day and night?