PPT-Near Earth Objects

Overview of the NEO Observation Program Lindley Johnson Planetary Science Division NASA HQ 21 June 2012 US component to International Spaceguard Survey effort Has provided 99 of new detections of NEOs since 1998. Recap. Distances in astronomy. Measuring distances directly with light travel time. Measuring distances geometrically with parallax. Measuring distances using . brightnesses. Distances using brightnesses. Gravity. Gravity is a force that for us is always directed downwards. But to say that gravity acts 
downwards is not correct. Gravity acts down, no matter where you stand on the Earth. It is 
better to say that on Earth gravity pulls objects towards the center of the Earth. So no matter 
where you are on Earth all objects fall to the ground. Universal Gravitation. Everything Pulls on Everything Else!. 13.1-13.2 . The Falling . Apple/Moon. Without . an outside . force, moving . objects continue to move at constant speed in a straight . line…. FREE FALL. Newton . observed the infamous apple falling from a tree, and drew important conclusions about the behavior of everyday objects under the force of gravity. . In the case of a feather and a coin, one would believe that a feather will always fall more slowly to the ground, and the coin faster. . Gravity. Gravity is a force that for us is always directed downwards. But to say that gravity acts 
downwards is not correct. Gravity acts down, no matter where you stand on the Earth. It is 
better to say that on Earth gravity pulls objects towards the center of the Earth. So no matter 
where you are on Earth all objects fall to the ground. Major components of the universe include . Galaxies. Black Holes. Nebulae. Stars. A . galaxy. is a large grouping of stars and interstellar gas and dust. These components are held together in the galaxy by their gravity. . Picture/rank the distances to the following objects: our Moon, Earth, Sun (or a star), our solar system, the Milky Way galaxy (our galaxy), the Andromeda Galaxy (nearest big neighbor galaxy to the Milky Way.. objects outside the Earth (astronomical objects). Ancient Astronomy. “Ancient” means from . time long past, especially before the end of the Western Roman Empire in 476 A.D.. Many ancient peoples, including in ancient China and India, made detailed observations about the objects in the sky. Section 1: Earth in Space. Pg. 514 . Basics. The study of the moon, stars and other objects in space is . Astronomy. .. The earth moves in 2 ways. Rotation. Revolution. Rotation. The spinning of the earth on it’s axis. Air pollution. Water pollution. Overpopulation. Erosion of soil. Climate change. Introduction of genetically modified species.. Destruction of biodiversity.. Devastation of natural habitats.. Diminishing natural resources.. Objects Big and Small. Objects Near and Far in the Sky. Office of Academics - Department of Science. Topic XVI: Objects Big and Small, Near and Far in the Sky. SC.K.E.5.5: Observe that things can be big and things can be small as seen from Earth. What can you see in the night Sky?. Moon- the earth’s only natural satellite. Satellite- is a body that orbits a planet. Planet- an object that orbits the sun. 5 are visible from earth without telescope- mercury, Venus, mars, Jupiter, and Saturn. 2. Asteroid . Belt. Asteroid Belt. 3. The four inner planets formed, . but Jupiter’s huge gravity caused . chaos in the region past Mars. . No big planet ever formed there. Primitive Solar System. 4. How the Universe is arranged. How stars form patterns in the sky. How the motions of bodies in space appear from Earth. Vocab. Orbit. – the path of an object in space as it moves around another object.