Examlex
A group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called
Demographic Information
Data related to the statistical characteristics of populations, such as age, race, gender, income, etc., often used in marketing and planning.
Secondary Data
Information that has already been collected and analyzed by other sources, such as reports, studies, and databases, used for research or decision-making purposes.
Primary Data
Original data collected firsthand for a specific research purpose through surveys, interviews, or experiments.
Syndicated Data
Data collected by market research firms that is sold to multiple companies, often used for market analysis and benchmarking.
Q5: If the sun produces energy by the
Q7: The changing period of a Cepheid variable
Q10: A young star cluster will have _
Q12: The center of our galaxy shows signs
Q19: The presence of vesicular basalts among the
Q32: Many pulsars have periods that are gradually
Q34: In Diagram 7-1,which of the transitions would
Q38: The rapid fluctuations of quasars show that
Q54: Earth's magnetic field has reversed itself.
Q59: You are standing near a railroad track