1 / 11

Astronomy

Astronomy. Astronomy is the study of space. Why is astronomy important? Provides understanding of our planet. Has resulted in vastly improved technology such as in computers. Has also given us teflon and velcro . The universe. Consists mostly of galaxies and dark matter.

bazyli
Download Presentation

Astronomy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Astronomy • Astronomy is the study of space. • Why is astronomy important? • Provides understanding of our planet. • Has resulted in vastly improved technology such as in computers. • Has also given us teflon and velcro.

  2. The universe • Consists mostly of galaxies and dark matter. • Galaxies are large groups of stars. • Dark matter is material that fills the space between galaxies, but does not emit light.

  3. Large distances • Miles or kilometers are far too small. • 1 AU or astronomical unit is distance from Sun to Earth, 150 million kilometers. • I light year is distance that light travels in a year, 9.5 x 1012 km • 1 parsec is 3.26 light years.

  4. Electromagnetic spectrum

  5. Electromagnetic spectrum • Radio waves—used in communications • Microwaves—cooking and communications • Infrared—heat radiation • Visible—what we see, ROY G BIV • Ultraviolet—skin cancer, tanning • X-ray—looking inside body • Gamma Ray—radioactive decay

  6. Telescopes • Visible—reflecting and refracting • Cherenkov—detect gamma rays • Also have telescopes that detect microwaves, infrared, ultraviolet, radio • Space telescopes: Hubble, Chandra x-ray, Compton gamma ray, Spitzer infrared.

  7. Earth motions • Rotates on axis creating days • Revolves around Sun creating years • Orbit is ellipse not circle • Perihelion closest to Sun • Aphelion furthest from Sun • Evidence of rotation and revolution—moving constellations

  8. Time zones

  9. Calendars • Julius and Augustus Caesar created modern calendar with leap year in February every four years. • Pope Gregory XIII created Gregorian calendar in 1500’s which eliminated leap years at even century years unless divisible by 400.

  10. Seasons • Caused by tilt of Earth, not distance from Sun. • Vernal and Autumnal equinoxes, meaning equal night. Day and night of equal length • Summer and Winter solstices. Longest and shortest day of year.

  11. Q and A • Describe the two types of matter in the universe. • Describe how the 7 types of electromagnetic radiation are used. • How many time zones are in the world? • Why do we have seasons?

More Related