Stars are continually forming in the halo of our Galaxy today.
Indicate whether the statement is true or false
Question 2
Ptolemy was important in the history of astronomy because he
A) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries.
B) developed the first scientific model of the universe.
C) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center.
D) was the first to believe that all orbits are perfect circles.
Renal calculi (stones) can form in several areas within the urinary tract. When they form in the kid
An example of a Hertzsprung–Russell diagram for a set of stars that includes the Sun
Pulsars are highly magnetized, rotating neutron stars that emit a beam of electromagnetic radiation.
The Types of Stars and Their Sizes
The Sun Today and as a Giant
Post–Main-Sequence Evolution of Low-Mass Stars