Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/system/clickytrackingcode/clickytrackingcode.php on line 19 Strict Standards: Declaration of JParameter::loadSetupFile() should be compatible with JRegistry::loadSetupFile() in /storage/content/10/173210/peterlinde.net/public_html/libraries/joomla/html/parameter.php on line 512 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/system/clickytrackingcode/clickytrackingcode.php on line 26 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/system/clickytrackingcode/clickytrackingcode.php on line 28 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/templates/a4joomla-stonewall/index.php on line 21 Deprecated: Non-static method JSite::getMenu() should not be called statically, assuming $this from incompatible context in /storage/content/10/173210/peterlinde.net/public_html/templates/a4joomla-stonewall/index.php on line 23 Deprecated: Non-static method JApplication::getMenu() should not be called statically, assuming $this from incompatible context in /storage/content/10/173210/peterlinde.net/public_html/includes/application.php on line 536 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/facebooklikeandshare/facebooklikeandshare.php on line 301 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/facebooklikeandshare/facebooklikeandshare.php on line 307 Hunting for life in the universe - A Cosmic Perspective
Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 31 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 54 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 57 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 59 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 66 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/flike/flike.php on line 90 Strict Standards: Only variables should be assigned by reference in /storage/content/10/173210/peterlinde.net/public_html/plugins/content/facebooklikeandshare/facebooklikeandshare.php on line 367

How Far Away Are the Stars?

Starsinthesky

ESO

To try to get a grip of the distances to the stars is not easy. Only two celestial bodies displays a surface to the naked eye observer, the Sun and the Moon. So they ought to be closer to us  than all the other points of light. Actually, by pure chance the Moon and the Sun have almost the same apparent size on the sky. In reality, the Moon is 400 times smaller than the Sun, but is on the hand 400 times closer. In this way, nature has given us the possibility to, in rare instances, see a total eclipse of the Sun, allowing us to see the Sun's glimmering corona by naked eye.

Certain points move among the stars, although you may need a few days or weeks to notice it. They are the planets, the ones visible to the naked eye are Venus, Mars, Jupiter and Saturn. Occasionally, you can also glimpse Mercury, although always quite close to the Sun.

Actually, also the stars are moving. But it takes thousands of years before such changes can be noticed. Their distances are measured in light years. But how far away is in fact the most distant star you can see with unaided eye? There are various answers, depending on how dark your sky is, but also due to the fact that such distances are not always very well determined. One candidate is the star  Rho Cassiopeiae. It has an apparent magnitude of 4.5 and is thus located in the constellation of Cassiopeia. It is known as a hypergiant and is considered to be 500 000 times more luminous than the Sun. Therefore it can be seen from a distance of about 10 000 light years.

 

Make a comment

TPL_A4JOOMLA-STONEWALL-FREE_FOOTER_LINK_TEXT