final exam part 2 PHS 111
On the H-R diagram our Sun is a _____________________.
star of average luminosity and temperature.
If the Sun collapsed to a black hole, the time required for the Earth to orbit the collapsed Sun would _______________.
stay the same
Dark Matter is matter that ___________________.
cannot be seen or felt, but can be measured through its gravitational effects
A supercluster is a______________________________.
cluster of galactic clusters.
General relativity is most concerned with _____________________.
gravitation. space-time geometry. acceleration
A star's color tells us ____________________.
its surface temperature.
Spacetime is curved by ____________________.
mass
How far is a light year?
nearly 10 trillion km
If the Sun collapsed to become a black hole, the Earth's gravitational attraction to it would be____________________.
no different
The "Big Bang" refers to the _________________________.
point in time in which the known (and perhaps knowable) universe came into being.
Cosmology is the study of the overall structure and evolution of ______________________.
the universe.
Which best describes the intrinsic motion of stars?
their motion relative to all other bodies
The Milky Way is _____________________.
a spiral galaxy.
What are the relative compositions of the materials from which stars form?
about 74% hydrogen, about 24% helium, no more than 2% other materials
The Large Megllanic Cloud is _______________________.
an irregular galaxy colliding with the Milky Way.