Chapter 4

Question Answer
Force that resists motion Friction
Galaxy that we live in Milky Way
One of the 3 galaxies closest to ours Small Magellanic Cloud
One of the 3 basic galactic shapes spiral
Large cloud of gas and dust floating in space nebulae
An area containing no air or any other matter vacuum
Star system containing from millions to billions of stars galaxy
Scientists who study outer space astronomers
Galaxy that resembles an egg or football elliptical
Study of outer space and all that it contains astronomy
Dark patches on the sun's photosphere sunspots
Part of the sun visible only during solar eclipse chromosphere or corona
High-speed streamof particles thattravel outward from holes in the sun's corona and beats upon the earth's upper atmosphere solar wind
3 basic types of galaxy shapes spiral, elliptical, irregular
Stars that outline a picture in the sky constellation
Familiar shape withinthe constellation Ursa Major which contains pointer stars Big Dipper
Hottest region of the sun Core
Streams of gas erupting from the chromosphere and returning in looplike fashion Solar prominence
Spiral arms attached to a straight bar that runs through a galaxy Barred spirals
Brightest star in the night sky Sirius
Pole star Polaris
Closest star to the earth Sun
Brightest star in constellation Leo Regulus
Brightest star in constellation Perseus Algol
Imaginary line that stretches from pole to pole axis of rotation
Star system that contain millions of billions of stars Galaxy
Cluster with about 40 galaxies in which we find Earth Local Group
How many miles away from the Earth is the sun? 93 million miles
Part of the sun's atmosphere closest to the surface chromosphere
Hottest region of the sun's atmosphere corona
Pair of stars that travel together and rotate around each other as the moon does the earth binary stars
Actual explosion of a star supernova
What is space like? no air (vacuum), no air friction, mostly black, weghtlessness. extremes of temperature
What is the difference between apparent magnitude and absolute magnitude? Apparent magnitude is the measurement used to describe the brightness of a star as it appears from earth. Actual brightness of a star is called absolute magnitude.

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