unit 5 topic 7 Flashcards
what is the sun mostly made of?
hydrogen
what do the cooler spots on the earth appear as?
they appear as dark spots on the sun they are called sunspots
the sun emits solar flares which create solar winds what protects the earth from these powerful effects
?
the earth’s magnetic field protects us also known as the ozone layer.
how is the energy released from the sun?
the sun’s own gravity has compressed its hydrogen so much that the temperature at the center of the sun is very hot. This is high enough for a kind of nuclear reaction (fusion) to take place. This is how the sun releases energy
what is the formation of our solar system based on and what are the three steps that follow
protoplanet hypothesis
- a cloud of gas and dust in space begin swirling
- most of the matter accumulates in the center- forming the sun
- the remaining materials accumulate forming planets and circle the sun
who were the first people to see the moon up close
Neil Armstong and Edwin aldrin
what are the inner planets
mercury, venus, mars and the earth
what are the outer planets and why are they similar
Jupiter, Saturn, Uranus, Neptune, and pluto they are similar beucase of hter gaseous composition
what are space probes
are unmanned satellites or remote controlled landers to explore the places where no human has ever been before
what can elliptical paths help astronomers and scientists trace?
trace and predict where bodies in space are, have been and will be in the future
how much is a astronomical unit and what is it used for?
used for measuring local distances in the solar system it is equal to the distance from the center of the sun to the center of the earth
what is a light year equal to?
to the distance light travels in 1 year, it is ised for longer distances to stars and galaxies
what is a parsec
is a basic unit of length for measuring distances to stars and galaxies
when we see light we are seeing it from the past true or false
true
very hot stars appear ?
blue
