By Mike Inglis
This is often the 1st of a two-volume set that care for the whole Milky approach. this primary quantity appears to be like at what will be noticeable predominantly from the Northern Skies. as well as the descriptive textual content, there are numerous megastar charts and maps, in addition to the newest updated pictures made via observatories around the globe and in area, in addition to pictures taken by way of novice astronomers.
Read or Download Astronomy of the Milky Way: Part 1: Observer's Guide to the Northern Sky (Patrick Moore's Practical Astronomy Series) (Pt.1) PDF
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Additional info for Astronomy of the Milky Way: Part 1: Observer's Guide to the Northern Sky (Patrick Moore's Practical Astronomy Series) (Pt.1)
Closer to the poles winds tend to flow from the northeast in the Northern Hemisphere and the southeast in the Southern Hemisphere, much like the trade winds. A fairly distinct boundary between the relatively warm mid-latitude westerly (blowing from west to east) winds and the cold polar easterly winds can often be found. It is along this “polar front” that lowpressure systems called cyclones frequently form. An overall effect of these storms is to send colder air toward low latitudes and warmer air toward the poles.
Limestone, a sedimentary rock, changes to marble as a result of such forces. Under stress, the mineral grains in the sedimentary rock shale grow in new directions to form slate, a metamorphic rock. Continued stress changes the slate to phyllite and then to schist, a rock that is very different in appearance, composition, and structure from the original shale. Quartzite, one of the hardest and most compact rocks, is the metamorphic form of the relatively soft, grainy sandstone, a sedimentary rock.
This may sound impressive, but it is less than one millionth the mass of the whole planet. 6 kilometers) of the Luminous layers of the atmosphere appear above the dark edge of Earth, at bottom, in an image captured at sunset by astronauts aboard the International Space Station. The orange and red layer is the lowest and densest layer of the atmosphere, called the troposphere, while the blue layer is the stratosphere. Courtesy, Image Science & Analysis Laboratory, NASA Johnson Space Center, No. ISS001-421-24 39 Earth and Its Moon ground.