Moon Phases New Moon Moon is so close

Moon Phases • New Moon: Moon is so close to sun that the side of the Moon Facing Earth is not Illuminated. • Full Moon: Moon is behind Earth in space with respect to the Sun. As sun sets Moon is fully exposed to sunlight.

Moon Phases -Names 1. New Moon 2. Waxing Crescent 3. First Quarter 4. Waxing Gibbous Moon 5. Full Moon 6. Waning Gibbous 7. Last Quarter Half Moon 8. Waning Crescent

Earth Circumference • Earth is classified as an oblate spheroid or ellipsoid. – Not a true sphere

Earth’s Circumference • Circumference around equator is larger than around the poles.

Earth’s Circumference • The equatorial bulge at Earth’s equator is caused by the planets rotation and gravity. • Naturally, gravity causes planets and other celestial bodies to contract and form a sphere. • The mass of an object as close to the center of gravity (Earth’s core in this case) as possible.

Introduction Sun Video • http: //www. watchknowlearn. org/Video. aspx? Video. ID=132 28&Category. ID=2824

The Sun - Fun Facts • 1 of 100 billion stars in the Milky Way Galaxy. • The Sun is not significant to the Universe, but it is our Solar Systems main source of energy. • Earth receives all of its energy from the Sun. – Food web – Energy sources

Structure of the Sun • The Sun can be divided into four parts: – Solar interior – Photosphere (visible surface) – Chromosphere (atmospheric layer) – Corona (atmosphere layer)

The Active Sun • Sunspots – A sunspot is a dark spot on the sun that is cool in contrast to the surrounding photosphere (visible surface) – Appear dark because of their temperature, about 1500 K less than the surface

The Active Sun • Prominences – Are huge cloudlike structures consisting of chromospheric gases. – Prominences are ionized gases trapped by magnetic fields that extend from regions of intense solar activity.

The Active Sun • Solar Flares – Solar flares are brief outburst (last about an hour) and appear as a sudden brighten of the region about a sunspot. – Solar flares release enormous amount so energy, much of it in the form of ultraviolet, radio, and X-ray radiation. – Auroras (Northern/Southern Lights) are a result of solar flares interacting with the upper atmosphere of Earth.

The Sun’s Energy *Remember Sun is spelled with a U. s. Un f. Usion • Nuclear Fusion – Is the way the sun produces energy. – Reaction converts 4 hydrogen nuclei into a helium atom creating an incredible amount of energy. – Energy is released because matter (hydrogen atom) is converted into energy.

Our Nuclear Energy Fission + energy • Here on Earth we can create energy as well, but not like the Sun. • Nuclear Power Plants use fission to create energy. – Splitting atoms into two or more parts plus energy. • The Sun uses fusion. – Two or more atoms coming together to make one atom plus energy. Fusio n + energy

Sun & The Electromagnetic Spectrum •