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Astronomy Crossword Puzzle

Across
Someone trained to travel into space for research and exploration.
A region of space having a gravitational field so intense that no matter or radiation (including light) can escape.
The basic building block from which galaxies are made. Stars develop when gravity compacts clouds of gas. When they become dense enough to sustain nuclear-fusion reactions, stars will emit light and sometimes other forms of electromagnetic radiation. The sun is our closest star.
A massive group of stars bound together by gravity. Galaxies, which each typically include between 10 million and 100 trillion stars, also include clouds of gas, dust and the remnants of exploded stars.
The envelope of gases surrounding Earth or another planet.
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
The natural satellite of any planet.
The galaxy in which Earth’s solar system resides.
Down
The star at the center of Earth’s solar system. It’s an average size star about 26,000 light-years from the center of the Milky Way galaxy. Or a sunlike star.
Usually a light-collecting instrument that makes distant objects appear nearer through the use of lenses or a combination of curved mirrors and lenses. Some, however, collect radio emissions (energy from a different portion of the electromagnetic spectrum) through a network of antennas.
The area of science that deals with celestial objects, space and the physical universe. People who work in this field are called astronomers.
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.
A non-native organism. (in astronomy) Life on or from a distant world.
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.