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Astronomy = the study of the universe. Astro = star Centr = center Geo = earth Retro = back Pre = before Peri = around Mar = ocean Terre = ground Sol = sun Chrom = color pro = first. Astronomical History!. Geocentric Model = moon, sun and planets orbit Earth.

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slide1

Astronomy = the study of the universe

Astro = star

Centr = center

Geo = earth

Retro = back

Pre = before

Peri = around

Mar = ocean

Terre = ground

Sol = sun

Chrom = color

pro = first

slide2

Astronomical History!

  • Geocentric Model = moon, sun and planets orbit Earth.
slide3

Astronomical History!

  • Heliocentric Model = Earth and other planets orbit sun.
slide4

Astronomical History!

  • Ptolemaic System = Planets orbit Earth, but seemed to exhibit retrograde motion.
slide5

Astronomical History!

Brahe: Yes, but my observations are much more precise.

Copernicus: Earth is a planet that orbits the sun.

Kepler: No, my 3 laws of planetary motionprove that Brahe is wrong.

Newton: The planets are held into a circle by the gravity of the sun.

Galileo: Well, here is how the planets and their satellites move.

slide6

Earth – Moon - Sun

Rotation = spinning

Revolution = going around another object

Earth Rotating http://svs.gsfc.nasa.gov/vis/a000000/a001300/a001374/index.html

Perihelion

Aphelion

CLOSEST

FARTHEST

slide7

SEASONS

Plane of the Ecliptic = reference plane that runs from pole to pole.

Plane is tilted about 23.5o.

Seasons are result of the tilt.

slide8

More Earth Movement

Precession = very slow wobbling

http://earthobservatory.nasa.gov/Features/Milankovitch/Images/milankovitch_precess_high.mov

slide9

Earth - Moon

Perigee = moon is closest to earth

Apogee = moon is farthest from earth

slide10

Phases of the Moon

http://videos.howstuffworks.com/hsw/10001-the-moon-phases-video.htm

slide12

ECLIPSE

Solar eclipse = moon is between earth and sun (like the background here!) and casts a shadow on Earth.

Lunar eclipse = Earth moves between sun and moon and casts shadow on moon.

slide13

Man on the Moon

http://news.sky.com/skynews/Home/World-News/Nasa-Releases-Footage-Of-Moon-Landing-When-Astronaut-Neil-Armstong-Took-First-Steps-On-July-20-1969/Article/200907315338603

slide14

Earth’s Moon

  • Gravity 1/6th that of Earth
  • 150 lb person = 25 lbs
  • The Only Natural Satellite
  • 1/4th diameter of Earth
  • Apollo moon mission 1969-1972
slide15

Craters

  • round depressions
  • produced by impacts

Compresses surface material.

Impact by meteor.

Rebound splash of ejecta.

Uplift of deep rock in center.

slide17

Major Topographic features of the Moon:

Highlands = light colored areas (almost as high as Mt. Everest!)

Mare (Maria, pl.) = dark smooth areas (ancient beds of lava)

Rilles are valleys or trenches.

Regolith = soil-like layer

slide18

Lunar History

When solar system was forming, a body the size of Mars impacted Earth and the debris shot into space. One piece was our Moon.

How the Moon Formed http://videos.howstuffworks.com/hsw/9998-the-moon-formation-video.htm

slide19

Formation of the Solar System

Nebular Theory = sun and planets formed from a rotating disk of dust and gases.

Planetesimals = small, irregular-shaped bodies that collided and clumped together to form the planets.

The Solar System

Terrestrial Planet = small and rocky (inner planets)

Jovian Planet = large gaseous (outer planets)

http://player.discoveryeducation.com/index.cfm?guidAssetId=21B610C4-B1BB-40E0-8760-825A41B19E12&blnFromSearch=1&productcode=US

slide20

Asteroids = small, rocky bodies floating in space

(Largest, Ceres, is about 1000 km in diameter!)

Comets = pieces of rocky and metallic materials held together

by frozen gases like water, ammonia, methane, etc.

(Some take hundreds of thousands of years to make one orbit.)

Small Pieces (w/Quiz) http://player.discoveryeducation.com/index.cfm?guidAssetId=BD722E4D-32D2-4342-B475-F031BFDC4EEC&blnFromSearch=1&productcode=US

slide21

Coma = the glowing head of a comet produced when the sun begins vaporizing the comet’s frozen gases.

Tail = stream of glowing vaporizing gases

Halley’s Comet

76-yr-orbit

slide22

Kuiper Belt = disc-shaped region beyond Neptune where short-orbital comets originate.

Oort Cloud = area spreading in all directions from the sun where long-orbital comets originate.

slide23

Meteoroid

  • small, solid particle
  • travels through space
  • origination
    • interplanetary debris
    • asteroid belt material
    • remains of comets

METEORS!

  • Meteor
  • meteoroid that enters Earth’s atmosphere
  • Meteor Shower = a group of meteors traveling in the same direction

Meteor in Peru 2007 http://news.bbc.co.uk/player/nol/newsid_7000000/newsid_7002300/7002376.stm?bw=bb&mp=wm&asb=1&news=1&ms3=54&ms_javascript=true&bbcws=2

slide24

The SUN

Photosphere = visible surface (90% hydrogen)

Chromosphere = thin layer of hot gases (can see during solar eclipse)

Corona= weak outermost layer (extends 1 million km)

Solar wind = streams of protons and electrons

slide25

Corona

Convective Zone

Radiative Zone

Core

Photosphere

Earth

Chromosphere

slide26

Activity of the Sun:

Sunspots= appear dark because they are cooler than the rest of the sun.

http://www.windows.ucar.edu/tour/link=/sun/atmosphere/sun_rotate_anim_jan2005.html&edu=high

Prominences= large cloudlike structures consisting of chromospheric gases.

slide27

http://images.google.com/imgres?imgurl=http://veimages.gsfc.nasa.gov/10194/a001168_pre.jpg&imgrefurl=http://visibleearth.nasa.gov/view_rec.php%3Fid%3D10194&usg=__0rK1487FipNjvZgrwD7bE1yTeO8=&h=242&w=320&sz=7&hl=en&start=13&um=1&itbs=1&tbnid=rfP8CkCb5ln2KM:&tbnh=89&tbnw=118&prev=/images%3Fq%3Dsolar%2Bflare%2Banimation%26ndsp%3D20%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:en-us%26um%3D1http://images.google.com/imgres?imgurl=http://veimages.gsfc.nasa.gov/10194/a001168_pre.jpg&imgrefurl=http://visibleearth.nasa.gov/view_rec.php%3Fid%3D10194&usg=__0rK1487FipNjvZgrwD7bE1yTeO8=&h=242&w=320&sz=7&hl=en&start=13&um=1&itbs=1&tbnid=rfP8CkCb5ln2KM:&tbnh=89&tbnw=118&prev=/images%3Fq%3Dsolar%2Bflare%2Banimation%26ndsp%3D20%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:en-us%26um%3D1

  • Solar Flares
  • explosive events
  • last about an hour
  • sudden brightening above a sunspot cluster
  • release enormous amounts of energy
  • ejects atomic particles
  • produce auroras (northern lights)

http://images.google.com/imgres?imgurl=http://earthobservatory.nasa.gov/images/imagerecords/3000/3912/flare_soh_2003301.jpg&imgrefurl=http://earthobservatory.nasa.gov/IOTD/view.php%3Fid%3D3912&usg=__1KWUaN-ZdTALrPPKRSxiynbT1xU=&h=865&w=540&sz=74&hl=en&start=3&um=1&itbs=1&tbnid=jLzIYZNVqdx_VM:&tbnh=145&tbnw=91&prev=/images%3Fq%3Dsolar%2Bflare%2Banimation%26ndsp%3D20%26hl%3Den%26safe%3Dactive%26rls%3Dcom.microsoft:en-us%26um%3D1

slide28

It’s how far??!!

1 Light Year = how far light travels in one year. Light travels at 299,792,458 m/s so in one year light goes 5.88 trillion (5.88 × 1012) miles.

1 A.U. (Astronomical Unit) is the distance from the Earth to the Sun which is 150 million km (93 million miles).

slide32

Sirius is the brightest star in the night-time sky. It is located in the constellation Canis Major. It is 8.5 light years away.

Pollux is 33.7 light years away.

Arcturus is 36.7 light years away.

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