What does AA mean in ACADEMIC & SCIENCE

Astronomy and Astrophysics are scientific disciplines that involve the study of planets, stars, galaxies, comets, dust clouds, the interstellar medium, magnetism and cosmic radiation. Astronomy focuses on the celestial bodies in our own solar system and beyond while Astrophysics looks at how those bodies interact.

Astronomers and astrophysicists use a variety of different techniques to make observations about stars, galaxies and other astronomical phenomena. They also create models to predict how different objects may behave over time. Furthermore they analyze data from satellites or spacecrafts about what they observe in the sky.

Becoming an astronomer or astrophysicist requires having a solid background in Maths and Physics as well as committing to extensive research work. To begin any career in either field usually requires obtaining advanced degrees such as Masters or PhDs on these subjects.

The main purpose of astronomy is to gain a better understanding of our universe from all perspectives including physical properties such as composition, evolution, origin structures etc., its space-time structure (including dark matter), and cosmology (the history and fate of entire universe).

The Hubble Space Telescope (HST) is designed for observing and recording high resolution images from outer space. It allows astronomers to observe ultraviolet wavelength regions inaccessible from ground-based observatories due to Earth’s atmosphere blocking out UV rays. HST also enables them to measure distances between stars accurately which helps with understanding stellar evolution models.

Black holes are areas of extremely intense gravity created by massive dying stars whose core collapses upon itself making it unable to emit enough energy outward to withstand its own gravitational pull. A single black hole's gravitational pull is so strong that nothing can escape it; not even light!

Due to the ever expanding nature of space it is estimated that there could be anywhere from 100 billion (1011) up to 2 trillion (2×1012) galaxies in the observable universe! However this number cannot be accurately determined yet due to technological limitations regarding our ability of directly observing outer space.

Dark matter makes up a significant amount of our universe but its exact nature remains unknown because it has never been observed directly! Astronomers have managed to uncover evidence for dark matter's existence through gravitational effects on other bodies but further research still needs to be done before its true nature can be revealed.

There are many theories about how the universe came into being but one widely accepted idea states that everything started when all matter was brought together due a sudden explosion called Big Bang approximately 13.8 billion years ago! This theory formed after studying redshift measurements indicating that galaxies were receding away from each other at an accelerated rate.

Although we have yet find conclusive proof for extraterrestrial life forms existing outside our own solar system we have found some potential indications pointing towards their existence such as organic molecules being identified in meteorites originating from Mars' surface or distant regions like Titan moon hosting oceanic conditions.