Size is "relative" in the universe.
From the NASA APOD Project:
Star Size Comparisons
Credit & Copyright: morn1415 (YouTube)
Explanation: How big is our Sun compared to other stars? In a dramatic and popular video featured on YouTube, the relative sizes of planets and stars are shown from smallest to largest. The above video starts with Earth's Moon and progresses through increasingly larger planets in our Solar System. Next, the Sun is shown along as compared to many of the brighter stars in our neighborhood of the Milky Way Galaxy. Finally, some of the largest stars known spin into view. Note that the true sizes of most stars outside of the Sun and Betelgeuse are not known by direct observation, but rather inferred by measurements of their perceived brightness, temperature, and distance. Although an inspiring learning tool that is mostly accurate, APOD readers are encouraged to complete the learning experience -- and possibly help make future versions more accurate -- by pointing out slight inaccuracies in the video.
Wednesday, February 23, 2011
Monday, February 07, 2011
Mapping the International Space Station (ISS): A timeline visualization of construction
This is a nice timeline visualization from USA Today on the "evolution of construction" for the International Space Station (ISS) - beginning in 1998 thru 2010.
Subscribe to:
Posts (Atom)