An HR gram
Pie Graph.
a "circle graph" is also a polar graph, it's used to graph polar coordinates.
the firt and second graph should be circled 2. the bar graph 3. the line graph
The mathematical technique used to calculate the area under a graph is integral calculus. This is a complex subject which I am not going to attempt to explain in detail- it normally takes years of study.
In graph theory, orientation refers to assigning a direction to the edges of an undirected graph, transforming it into a directed graph (or digraph). This process determines a specific direction for each edge, allowing for the representation of relationships that have a clear start and end point. Orientation can be used to study properties such as reachability, connectivity, and flow within the graph. Different orientations can lead to distinct properties and behaviors in the resulting directed graph.
One graph used to relate stars' absolute magnitudes and their spectral types is the Hertzsprung-Russell diagram, better (and more simply) known as the H-R diagram.
Pie Graph.
telescopes
Telescopes
The study of the stars is astronomy.
Spectroscope
Why did Asians study stars
Arecibo
People in the past usually studied the stars because they used it to make Calenders and days
Hertzsprung-Russell diagram. This diagram plots a star's luminosity against its temperature (or color), allowing scientists to classify stars by size, brightness, and lifecycle stage.
The proper name for the study of stars is astronomy. A person who studies stars is an astronomer.
An observatory is a location used for observing terrestrial and/or celestial events