Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
what is a light-year
|
the distance a light travels in a year
|
|
|
nebula
|
a churning cloud of gas and dust that new stars form from
|
|
|
supernova
|
a giagantic explostion that hurls matter and energy far out into space
|
|
|
black hole
|
a point in space that has so much gravity that nothing can escape
|
|
|
galaxy
|
a huge system of stars, dust, and gas held together by gravity
|
|
|
constellation
|
a group of stars that forms a pattern
|
|
|
spiral galaxy
|
have bright bulging middles and whispy arms--like the Milky War
|
|
|
elliptical galaxies
|
are more oval shaped, like a football
|
|
|
Galileo's discoveries
|
* moon has mountains
* the sun spins * the Earth revolves around the sun |
|
|
why have telescopes been sent into space
|
conditions are always clear and dark
|
|
|
why ancient cultures watched movements of the sun and moon
|
to predict seasons and know when to plant
|
|
|
what are two factors that affect how bright a star looks
|
1. how close it is to Earth
2. how much energy it gives off 3. hot hot it is |
|
|
astronomy
|
the study of the sun, moon and stars
|
|
|
astronomy tools
|
* radio and space telescopes * astrolabe
|
|
|
Stonehenge
|
a giant circle of stones built by ancient people in England 5000 years ago that scientists think were linked to astronomy.
|
