I'm not sure when it happened, but it seems that if you aren't signed up to Pinterest, you can no longer see the images in my articles. Apologies for this, but it's going to take quite some while to remedy.
Meanwhile I have set up new links for the two images in the Mizar and Alcor article. Those should now be visible to everyone.
And here they are, as well:
Big Dipper, with
Zeta Ursae Majoris, the second star from the end of the handle. It's the famous double star Mizar and Alcor. (Credit: Jerry Lodriguss)
With the parallax technique astronomers observe object at opposite ends of Earth’s orbit around the Sun to precisely measure its distance. (CREDIT: Alexandra Angelich, NRAO/AUI/NSF)