He suggested that the rockets should be powered by liquid propellants. Many people call Tsiolkovsky the father of modern astronautics. Their spectrum has broad and very intense emission lines, probably indicative of violent surface activity. They may be protostars in the later stages of formation, young stars that are not yet stable main sequence stars in the Hertzsprung-Russell Diagram . Scintillation in caused when the star's light is distorted by the Earth's atmosphere .
Scintillation is greater for bright stars that are low on the horizon.
It is also known as astronomical scintillation. As stated in our privacy policy , we fully respect your privacy and will not use your e-mail address for any purpose other than the newsletter subscription. Search the Web with our sponsor, Overture. Without our visitors' support, Enchanted Learning would soon be off-line.