science mp3

science mp3

welcome back class 309 im your Science teacher

Unit 4

for this unit we are going to learn about our planents

Planents

• Mercury

• Venus

• Earth

• Mars

• Jupier

• Saturn

• Uranus and Venus

solar system

• 8 planets

• 1 big star called the sun

• Milky Way

• Distance to Galactic Center: 27,000 ± 1,000 ly

• Distance to Kuiper cliff: 50 AU

• Distance to heliopause: ≈120 AU

• Orbital period: 225–250 myr

solar system

• Orbital speed: 220 km/s; 136 mps

• Nearest star: Proxima Centauri (4.25 ly); Alpha Centauri (4.37 ly)

• 1,000,000,000+ stars

Mercury

• we are going to learn about mercury for one week and have a project and test

Mercury

Mercury is the smallest and closest planet to the sun in the Solar System. Its orbit around the Sun takes 87.97 Earth days, the shortest of all the planets in the Solar System. The Sumerians also knew of Mercury since at least 5,000 years ago. It was often associated with Nabu, the god of writing. Mercury was also given separate names for its appearance as both a morning star and as an evening star. Greek astronomers knew, however, that the two names referred to the same body, and Heraclitus, around 500 B.C., correctly thought that both Mercury and Venus orbited the sun, not Earth. 

Mercury

Because the planet is so close to the sun, Mercury's surface temperature can reach a scorching 840 degrees Fahrenheit (450 degrees Celsius). However, since this world doesn't have much of a real atmosphere to entrap any heat, at night temperatures can plummet to minus 275 F (minus 170 C), a temperature swing of more than 1,100 degrees F (600 degrees C), the greatest in the solar system. Mercury is the smallest planet — it is only slightly larger than Earth's moon. Since it has no significant atmosphere to stop impacts, the planet is pockmarked with craters. About 4 billion years ago, an asteroid roughly 60 miles (100 kilometers) wide struck

Mercury

Mercury with an impact equal to 1 trillion 1-megaton bombs, creating a vast impact crater roughly 960 miles (1,550 km) wide. Known as the Caloris Basin, this crater could hold the entire state of Texas. Another large impact may have helped create the planet's odd spin.

Open Ended

write what you learn about mercury (its okay if you say nothing)