Stars twinkle, while planets (usually) shine steadily. Why? Stars twinkle because Б theyБre so far away from Earth that, even through large telescopes, they appear only as pinpoints. And itБs easy for EarthБs atmosphere to disturb the pinpoint light of a star. As a starБs light pierces our atmosphere, each single stream of starlight is refracted Б caused to change direction, slightly Б by the various temperature and density layers in EarthБs atmosphere. You might think of it as the light traveling a zig-zag path to our eyes, instead of the straight path the light would travel if Earth didnБt have an atmosphere. Planets shine more steadily because Б theyБre closer to Earth and so appear not as pinpoints, but as tiny disks in our sky. YouБd could see planets as disks if you looked through a telescope, while stars would remain pinpoints.
The light from these little disks is also refracted by EarthБs atmosphere, as it travels toward our eyes. But Б while the light from one edge of a planetБs disk might be forced to БzigБ one way Б light from the opposite edge of the disk might be БzaggingБ in an opposite way. The zigs and zags of light from a planetary disk cancel each other out, and thatБs why planets appear to shine steadily. You might see planets twinkling if you spot them low in the sky. ThatБs because, in the direction of any horizon, youБre looking through more atmosphere than when you look overhead. If you could see stars and planets from outer space, both would shine steadily. ThereБd be no atmosphere to disturb the steady streaming of their light.
Can you figure out which objects are stars and which are planets just by looking for the twinklers vs the non-twinklers? Experienced observers often can, but, at first, if you can recognize a planet in some other way, you might notice the steadiness of its light by contrasting it to a nearby star. Bottom line: Stars twinkle because they appear as tiny pinpoints as seen from Earth, even through telescopes. Planets donБt twinkle because they are closer, and thus appear larger in our sky, as tiny disks instead of pinpoints.
A Night Observatory, astronomers measure the apparent diameter of a star determines the extent of his field of vision Observatory is bad! The field of view is worse, these pills would be larger. On a typical night, the larger the field of view will be worse than the pill. 100 seconds of arc).
On the ground, the best possible field of vision is usually about half a second of arc The atmosphere is totally dependent on the level of turbulence. The field of view will change with time. Sometimes the atmosphere suddenly very quiet for a few seconds, theOn this page you will be the star shrinks dramatically since Nvrstarh small region is more centered Shvdmmkn fainter stars have not seen before in your area to find Observatory. Imagine that you are sitting behind a telescope eye for several minutes looking for that little star Nvrmrkzy a nebula looking for this star right border of your telescope s field of vision. For a moment it occurs suddenly and with a pale blue star like his spirit within you will see a drop appear and just seconds later sight disappears