Andromeda Galaxy Galaxy closest to ours 2 5

Andromeda Galaxy – Galaxy closest to ours 2. 5 Million light year away

Intro to astronomy youtube • http: //www. youtube. com/watch? v=D 8 z. ZZZ zpp. IM

Light year • Distance Light travels in one year in a vacuum • Equals 300, 000 km/sec or 186, 000 mi/sec • A light year is about 6 trillion miles long

Crab nebula

Universe • Current Theory of Origin – Big Bang • All matter and energy was once together in one point and exploded in all directions forming the universe • Age 10 – 16 Billion Years

Big Bang Evidence • 1. Cosmic Background Radiation – Residual energy (or faint microwave radiation) found all over in space due to the cooling of the fireball, energy is the echo of Big Bang

• http: //www. youtube. com/watch? v=Kg 9 F 5 p N 5 tl. I • http: //www. wwnorton. com/college/astrono my/21 st-century-astro 3/astrotours. aspx

Doppler Effect

Big Bang Evidence Longer wavelengths Shorter wavelengths

Big Bang Evidence If shifted towards the UV, its blue shifted If shifted towards the IR, its ree shifted 2. Every object in universe is red shifted Meaning the universe is expanding

Doppler Effect

• http: //www. youtube. com/watch? v=Fhfnqbo ac. V 0 • http: //www. youtube. com/watch? v=J 43 l. AE Sft. Ps

• http: //www. youtube. com/watch? v=fgg 2 tp. U Vb. XQ&feature=channel