Astr 102 Mt 1

Front 1

The
Doppler shift

Back 1

Explains the shift of spectra due to the
velocity of the source relative to the
observer.

Front 2

Which large optical telescope
project does Canada hope to
join

Back 2

D. The ESO Extremely Large Telescope

Front 3

What does the term “Milky
Way” refer to?

Back 3

B. A band of light in the night sky

C. A galaxy of billions of stars that
contains the sun

Front 4

Are flashlights and headlamps
standard candles?

Back 4

no

Front 5

Two stars are at the same
distance, and have the same
apparent brightness. Could
they be standard candles?

Back 5

Yes

Front 6

property of a globular cluster (3)

Back 6

A. Masses up to millions of solar masses
C. Contain pulsating variables
D. Hundreds in galaxies like the Milky
Way

Front 7

What evidence suggests that
the sun is not at the centre of
the Milky Way?

Back 7

B. Existence of strong dust absorption in
the plane of the Milky Way
C. Distances of globular clusters

Front 8

Why do some galaxies have
negative velocities?

Back 8

A. rotation of Milky Way

D. Some galaxies are falling together
because of gravity

Front 9

Which of the following argues
that spiral nebulae are “island
universes”?

Back 9

B. Lots of novae like in the Milky Way
D. Very high velocities away from the
Milky Way

Front 10

What is the velocity of a
galaxy whose distance is 100
Mpc? [Assume Ho=73]

Back 10

7300 km/s

Front 11

Dark matter is mostly

Back 11

Exotic particles

Front 12

What is the cosmological
redshift?

Back 12

The expansion of space with a little Doppler shift of galaxies

Front 13

A wave of light is emitted by a distant galaxy.
Some time later we observe it, and find that
the observed wavelength is twice the wavelength
that it was emitted at. What was the
size of the Universe when the light was
emitted?

Back 13

Half the present size

Front 14

evolution of the Universe

Back 14

Temperature getting cooler with time &

density decreasing with time

Front 15

Why is the density of the
Universe decreasing?

Back 15

Universe is expanding

Front 16

Why were there no nuclear reactions in
the big bang before t=1 sec, when the
Universe was hotter and denser?

Back 16

There were reactions – it’s just that energetic
photons split apart the products of the
reactions as soon as they were created.

Front 17

Where does iron come from?

Back 17

Exploding stars

Front 18

The big bang radiation currently has a
temperature of 3 K. At what wavelength is
the bulk of this radiation?

Back 18

1 mm

Front 19

Two stars the same size: one has a
temperature of 5000 K, the other 15000
K. How much power does the hot one
emit compared to the cool one?

Back 19

81x as much

Front 20

observational evidence of a hot dense
big bang

Back 20

Abundance of Helium atoms

Microwave background looks the same
in opposite regions of the sky
Lots of microwave light flooding the
Universe