The location of the Galactic Center was first found by Harlow Shapley with
A) radio emissions from Sagittarius A.
B) RR Lyrae variables in the globular clusters.
C) Cepheids of population I in the spiral arms.
D) infrared observations of the heat from its accretion disk around the black hole.
E) planetary nebulae in the open clusters.
Question 2
Which of these variable stars would be classified as a Cepheid?
A) a G giant with a period of 14 hours
B) a B supergiant with a period of 0.14 days
C) a K giant with a period of 14 days
D) an F giant with a period of 14 years
E) an M supergiant with a period of 140 days
Juvenile American alligator swimming, showing the distinctive yellow striping found on juveniles
Ectodermal Galactic Bands, Supernumerary Nipple
A second jetliner approaches the south tower of the World Trade Center on September 11, 2001. The no
An embedded particle of something was found on one of the gears, making this pump worthless except ...
General location of the primary auditory cortex and areas of secondary auditory cortex. Most ...
The Geographer’s Toolbox: Location, Maps, Remote Sensing, and GIS