astronomy

• the planets are mercury, venus, earth, mars, jupiter, saturn, uranus, neptune
• mercury has no moons or rings
• the sun is the center of our solar system
• mercury is the closest planet to the sun
• venus is the hottest planet with an atmosphere that traps heat from the sun
• venus is the second closest planet to the sun
• earth is the only known habitable planet
• earth is the third closest planet to the sun
• mars has two small moons phobos and deimos
• venus is known as the morning star because it rises just before dawn
• mars is also called the red planet because its surface appears reddish-brown due to iron oxide (rust)
• uranus was discovered by william herschel on march 13, 1781
• saturn's rings are made up mostly of ice particles that range from tiny dust grains to boulder-sized chunks
• jupiter is the largest planet
• mercury is the smallest planet
• uranus is tilted on its side which causes extreme seasons
• saturn has rings made up of ice particles
• saturn is the sixth planet from the sun
• pluto is no longer considered a planet but rather a dwarf planet
• a year is one orbit around the sun
• a comet is an object composed mainly of rock, gas, and ice that orbits the sun
• meteoroids are small objects floating through space
• neptune is the farthest gas giant from the sun