Examlex
Contrast the sizes of molecular clouds with emission nebulae.
Cardiovascular Disease
A general term for conditions affecting the heart or blood vessels, often related to atherosclerosis or the build-up of plaque in the arteries.
United States
A federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions, known for its influence on global culture, economy, and politics.
Unintentional Injuries
Injuries that occur without intent to harm, often resulting from accidents or lack of caution, and can be a major public health concern.
Life Expectancy
The average number of years an individual is expected to live based on current mortality trends and health conditions.
Q3: Collisions or near collisions are necessary to
Q19: Sunspots:<br>A) are always found close to the
Q20: Apply Wein's law to explain the corona's
Q49: Reflection nebulae usually appear red.
Q66: Pluto was discovered in:<br>A) ancient times.<br>B) 1789.<br>C)
Q75: What is the relationship between a star's
Q84: An emission nebula appears primarily _ in
Q93: The Roche lobe of a star in
Q95: What part of a comet has only
Q96: If successive generations of stars return material