Astronomy Root Word

Astronomy is the scientific study of celestial bodies, including stars and galaxies. It is also known as cosmology.

Scientists have observed the movements of celestial objects since ancient times. They combined this knowledge with their beliefs to predict future events on Earth (astrology).

During the 17th century, astronomy advanced significantly with the development of the telescope. This led to major discoveries in the field.


The study of celestial objects and events that occur outside the earth’s atmosphere. Astronomers use telescopes and other scientific equipment to observe and collect data about the universe.

The astronomy of stars is the science that describes their apparent positions and motions. It also explains their origins and chemical compositions. The word astronomy comes from two Greek words: astron, meaning star, and nomos, meaning law or system.

The astronomy of planets is the science that studies their movements and interactions with each other and other cosmic bodies. It includes the physics of stars, the formation of galaxies, and the life cycles of stars. Astronomy is the oldest of all sciences and has a history that dates back thousands of years. Astronomy has helped humans better understand our place in the universe and the forces that shape it. Astronomy is often (but not always) focused on very concrete, observable things, as opposed to cosmology, which is more concerned with the large-scale properties of the universe and theories like dark matter and dark energy.


Staring at stars and pondering their movements requires a person focused on detail and removed from the petty distractions of earthly life. Astronomers use large telescopes to track and study the energy emitted by stars and movement of planetary bodies. This highly cerebral field of study is also referred to as astrophysics or the study of celestial bodies.

An astronaut is a person trained to operate and work aboard spacecraft. NASA and other space agencies recruit candidates for the astronaut program, who undergo grueling training programs before they’re assigned to a mission. Astronauts are figures of awe and admiration, and it’s not uncommon for people to have aspirations of becoming one someday.

The word astronaut comes from the Greek astron and Latin nautes. It was adopted by NASA in 1961 to describe those who would participate in space exploration missions. The Russian equivalent is cosmonaut, which comes from the root kosmos. These explorers are often trained military personnel, but recent accessibility of space travel has allowed civilian astronauts to fly into orbit.


An asteroid is a rocky or metallic object in space that circles the Sun. It’s what’s left over from the material that made the planets in our solar system billions of years ago. Asteroids can vary in size, from a pebble to a dwarf planet larger than Jupiter. Most are found in the asteroid belt, which lies between Mars and Jupiter.

Astronomers have a lot of fun naming asteroids. Some of them have whimsical names, such as one named after Mr. Spock from Star Trek, and others are named after late rock musicians and celebrities.

The prefix astro comes from the Greek word astron, meaning “star.” It’s used in words that relate to stars and celestial bodies, as well as activities, such as spaceflight, that take place outside the Earth’s atmosphere. Some examples include astronomy, astronaut, asteroids, and astrocytes. Astronomy is a scientific discipline that has a rich heritage that continues to inspire generations of scientists.


Astrocytes are star-shaped glial cells that perform many different functions including structural support, regulation of the chemical environment and neuronal metabolism. They also engulf CNS synapses to eliminate cellular debris through MEGF10 and MERTK phagocytic pathways. During brain development, astrocytes help to provide guidance cues for neuronal cell migration and expansion from progenitor cells in the subventricular zone (SVZ).

Astrocytodes communicate with neurons through gap junctions and release various substances including calcium, ions, prostaglandins and nitric oxide. They also regulate local blood flow in the central nervous system (CNS) and are the main glucose storage units of the brain.

Unlike other cells, astrocytes have high-affinity uptake systems for glutamate and gamma-aminobutryic acid, which may explain why they are able to control synaptic transmission. They can also rapidly clear away chemical messengers from the synapse, called neurotransmitters, to reset the synapse for the next transmission. This is important, because if the neurotransmitters lingered too long they would interfere with communication between neurons.

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