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Classroom Activities & Resources
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Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. The term "evolution" usually refers to the biological evolution of living things. But the processes by which planets, stars, galaxies, and the universe form and change over time are also types of "evolution. In the late s the American astronomer Edwin Hubble made a very interesting and important discovery. Hubble made observations that he interpreted as showing that distant stars and galaxies are receding from Earth in every direction. Moreover, the velocities of recession increase in proportion with distance, a discovery that has been confirmed by numerous and repeated measurements since Hubble's time.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. These astronomers were aware of only six of the nine planets that orbit the Sun. Although they studied the stars, they did not know that the stars were like the Sun, nor did they have any concept of their distances from Earth. We now know that our Sun is but one of billion stars in the Milky Way Galaxy, which is but one of about billion galaxies in the visible universe. More remarkably, our telescopes have been able to peer billions of years into the past to see the universe when it was young—in one case, when it was only a few hundred thousand years old.
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A galaxy is a gravitationally bound system of stars , stellar remnants , interstellar gas , dust , and dark matter. Galaxies range in size from dwarfs with just a few hundred million 10 8 stars to giants with one hundred trillion 10 14 stars,  each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical ,  spiral , or irregular. For comparison, the Milky Way has a diameter of at least 30, parsecs , ly and is separated from the Andromeda Galaxy , its nearest large neighbor, by , parsecs 2. The space between galaxies is filled with a tenuous gas the intergalactic medium having an average density of less than one atom per cubic meter. The majority of galaxies are gravitationally organized into groups , clusters , and superclusters.
Brenneman, Laura W. Behr, Bradford B. Tornado Spectral Systems, Toronto, Canada. Last reviewed: July Everything in existence, including all matter and energy, and the enormous volume which contains them.
GS The Earth in Context: Universe and Solar System. I. Astronomy. A. Earth's Sun: one of > billion stars in the Galaxy Milky Way. (1). Galaxy.
The universe is filled with billions of star systems. Located inside galaxies, these cosmic arrangements are made up of at least one star and all the objects that travel around it, including planets, dwarf planets, moons, asteroids, comets, and meteoroids. Astronomers believe it formed about 4. Along with the sun, our cosmic neighborhood includes the eight major planets. The closest to the sun is Mercury , followed by Venus , Earth, and Mars.
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Space Science Teaching Resources. This makes the First Australians the oldest astronomers and the oldest continuing cultures in the world. Ep46 11m 9s. How many seconds old are you? Express with 2 sig figs in scientific notation. Research a planet with our science graphic organizer activity or answer questions about moon phase images.
Everything has a shadow! Shadows illustrate how three-dimensional objects can be viewed in two dimensions. Students explore the Earth and Sun's postions in relation to the constellations of the ecliptic with a small model. They explore the motions of the Earth and inner planets in a larger classroom-size model. A very interactive and fun activity. Does the Moon always look the same?