Before telescopes existed, astronomers considered all such faint deep-sky objects to be nebulae. With the advantage of modern telescopes, though, we can see that some of those colorful points of light are "true" nebular clouds, some are star clusters, and some are entire galaxies. ...
Nebulae are small fuzzy patches you see in the sky, they look like little clouds.Many of them have a spiral shape, and that's why we called them spiral nebulae.So astronomers in the eighteenth century, eighteenth century, when they looked through the telescope, they could see planets-and ...
The cosmic scenery of the universe consists of star clusters, groups of very numerous stars that appear to be a cloud; nebulae, glowing clouds of gas or dust, and; galaxy clusters and superclusters. Basically, the universe is all the existing space-time and all its content...
Stargazers might like to try the venerableWebb Deep-Sky Society's Visual Atlas of the Magellanic Clouds, which is a guide to deep-sky objects such as emission nebulae, planetary nebulae, dark nebulae and star clusters in the Magellanic Clouds. To keep up to date with the latest research and...
What did eighteenth-century astronomers have in common with astronomers today?A.They could not explain everything they detected with their instruments.B.They knew the correct distances of objects they could not identify.C.Their instruments were not powerful enough to detect spiral nebulae.D.They ...
such as the more dim nebulae. And at this age more physical restrictions are likely to crop up, so I'm definitely interested and saving money as we speak. Once the time comes you guys will have enabled me to make a well-informed choice. Outreach isn't something I'd considered, but it...
Born 1889, Hubble became the first American astronomer to identify Cepheid variables in M31 – which in turn established the extragalactic nature of the spiral nebulae. Continuing with the work of Carl Wirtz, and using Vesto Slipher’s redshifts, Hubble then could calculate the velocity-distance...
A: Snow had the handle of the pump removed so that it could not be used. 3 Q: How ? A: The cholera threat was defeated thanks to the work of Joh Snow. 6 In groups, discuss the following questions. 1 What was the most important tool Snow used to defeat cholera? What common medica...
A phase could be as short as 24 minutes (near the equator) or several weeks (near the poles). At mid-latitudes, it can last anywhere from a half hour (fall to spring months) to one hour (summer months). For mid-latitudes, the Sun is at a lower angle with the horizon, so twiligh...
Emission nebulae are often star-forming regions, and are being ionized by the hard ultraviolet light from the young, massive stars born within them. Radioactive decay Not all atoms are stable. Some isotopes are unstable and will spontaneously decay. There are several types of decay. One is ...