Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Vocabulary Part Two
Document related concepts
Transcript
The Universe and Solar System Vocabulary Part Two Comets A small body if ice, rock, and cosmic dust that follows an elliptical orbit around the sun. It gives off gas and dust in the form of a tail as it passes close to the Sun. The tail always points away from the Sun due to solar winds. Asteroids A small, rocky object that orbits the Sun, usually in a band called the asteroid belt between the orbit of Mars and Jupiter. Meteoroid Small, rocky body that travels through space. Meteor Bright streak of light that results when a meteoroid burns up in the Earth’s atmosphere. Sometimes called a “shooting star”. Meteorite A meteoroid that reaches Earth’s surface without burning up completely. Galaxies A collection of stars, dust, and gas bound together by gravity. Milky Way Galaxy Our solar system is located in this galaxy. Big Bang Theory Theory that states that the universe began with a tremendous explosion where all matter and energy was concentrated. The universe is expanding outward. According to this theory, the universe is about 13.7 billion years old. One way scientists calculate the age of the universe is measure the distance from Earth to various galaxies.
