This cosmologist studies dark matter, an invisible part of the universe

Apollo 11: The first space flight ever to land humans on the moon. Two astronauts, named Neil Armstrong and Buzz Aldrin, landed there on July 20, 1969. They spent nearly 22 hours on the moon. They collected a handful of rocks and other samples that were returned home for scientists to study. 

Big Bang: The rapid expansion of dense matter and space-time that, according to current theory, marked the origin of the universe. It is supported by astronomers’ current understanding of the composition and structure of the universe. 

black hole: A region of space having a gravitational field so intense that no matter or radiation (including light) can escape. 

cancer: Any of more than 100 different diseases, each characterized by the rapid, uncontrolled growth of abnormal cells. The development and growth of cancers, also known as malignancies, can lead to tumors, pain and death. 

clinical: (in medicine) A term that refers to diagnoses, treatments or experiments involving people. 

cosmologist: A scientist who studies the origin and development of the cosmos, or universe. 

dark matter: Physical objects or particles that emit no detectable radiation of their own. They are believed to exist because of unexplained gravitational forces that they appear to exert on other, visible astronomical objects. 

data: Facts and/or statistics collected together for analysis but not necessarily organized in a way that gives them meaning. For digital information (the type stored by computers), those data typically are numbers stored in a binary code, portrayed as strings of zeros and ones. 

develop: To emerge or to make come into being, either naturally or through human intervention, such as by manufacturing. (in biology) To grow as an organism from conception through adulthood, often undergoing changes in chemistry, size, mental maturity or sometimes even shape.  

earthquake: A sudden and sometimes violent shaking of the ground, sometimes causing great destruction, as a result of movements within Earth’s crust or of volcanic action. 

evolve: (adj. evolving) To change gradually over generations, or a long period of time.  

field: An area of study, as in: Her field of research is biology. Also a term to describe a real-world environment in which some research is conducted, such as at sea, in a forest, on a mountaintop or on a city street. It is the opposite of an artificial setting, such as a research laboratory.  

graduate school: A university program that offers advanced degrees, such as a Master’s or PhD degree. It’s called graduate school because it is started only after someone has already graduated from college (usually with a four-year degree). 

gravity: The force that attracts anything with mass, or bulk, toward any other thing with mass. The more mass that something has, the greater its gravity. 

insight: The ability to gain an accurate and deep understanding of a situation just by thinking about it, instead of working out a solution through experimentation. 

media: A term for the ways information is delivered and shared within a society. It encompasses not only the traditional media — newspapers, magazines, radio and television — but also digital outlets, such as Twitter, Facebook, Instagram, TikTok and WhatsApp. The newer, digital media are sometimes referred to as social media. The singular form of this term is medium. 

meteorologist: Someone who studies weather and climate events. 

model: A simulation of a real-world event (usually using a computer) that has been developed to predict one or more likely outcomes. Or an individual that is meant to display how something would work in or look on others. 

Nobel Prize: A prestigious award named after Alfred Nobel. Best known as the inventor of dynamite, Nobel was a wealthy man when he died on December 10, 1896. In his will, Nobel left much of his fortune to create prizes to those who have done their best for humanity in the fields of physics, chemistry, physiology or medicine, literature and peace. Winners receive a medal and large cash award. 

perimeter: The outer border or edge of some defined area. For instance, the perimeter of some people’s property is set off by a fence. 

phenomenon: Something that is surprising or unusual. 

physics: The scientific study of the nature and properties of matter and energy. Classical physics is an explanation of the nature and properties of matter and energy that relies on descriptions such as Newton’s laws of motion. Quantum physics, a field of study that emerged later, is a more accurate way of explaining the motions and behavior of matter. A scientist who works in such areas is known as a physicist. 

role model: Someone whose skill, behavior and/or personality makes them an inspirational ideal, the type who inspires others to model themselves after this person. 

seismologist: Someone who works in the field of science concerned with earthquakes and related phenomena. These people read the signature of ground movements from the passage of energy waves through rock. 

theoretical: An adjective for an analysis or assessment of something that based on pre-existing knowledge of how things behave. It is not based on experimental trials. Theoretical research tends to use math — usually performed by computers — to predict how or what will occur for some specified series of conditions. Experimental testing or observations of natural systems will then be needed to confirm what had been predicted. 

theoretical physics: A branch of physics that uses mathematical models to understand the nature and properties of matter and energy. A scientist who works in that field is known as a theoretical physicist . 

universe: The entire cosmos: All things that exist throughout space and time. It has been expanding since its formation during an event known as the Big Bang, some 13.8 billion years ago (give or take a few hundred million years).