use articles
What are the uses of a spectrometer?
A spectrometer is fundamentally an instrument designed to measure the intensity of light across a specific range of wave...
What can you do with old urine?
The accumulated volume of human urine, often seen strictly as waste requiring disposal, is increasingly recognized as a ...
What are the uses of carbonic acid in everyday life?
The substance known as carbonic acid ($\text{H}_2\text{CO}_3$) might sound like a purely academic chemical, confined to ...
Why can't we use water as fuel?
The idea of powering a vehicle using only a tank of tap water is compelling, often presented as the ultimate clean energ...
What can I use as substrate?
The foundation of any contained ecosystem, whether it’s a tropical planted aquarium, a desert reptile terrarium, or a co...
What elements are used to make a star?
The composition of a star is one of the most fundamental questions in astronomy, moving us from the simple notion of a s...
What did Galileo use to observe the Moon?
The first tool Galileo Galilei turned toward the heavens that truly changed astronomy was not a massive observatory inst...
Why don't Americans use SI units?
The question of the United States’ unique relationship with measurement units is less about stubbornness and more about ...
What are the three things used to measure mass?
Mass is an intrinsic characteristic of an object, representing the sheer *quantity of matter* it contains [^1]. While of...
What are the limitations of using an astronomical refracting telescope?
The refracting telescope, the classic design popularized by Galileo, relies on objective lenses to gather and focus ligh...
What did Galileo use to study the stars?
The initial tools Galileo Galilei employed to study the stars were a direct refinement of existing, relatively simple op...
Which of the following laws do astronomers use to determine the mass of stars using observations of binary star systems?
The most direct method astronomers have for weighing stars, those distant suns that appear as simple points of light, in...
What model did Kepler use?
Johannes Kepler inherited a universe in transition, a celestial stage where the long-reigning Ptolemaic system was being...
What tool is used to measure the distance between stars?
Measuring the distance to the stars is one of astronomy’s oldest and most fundamental challenges. Unlike measuring dista...
What instrument did Galileo use to observe the sky?
The device Galileo Galilei employed to revolutionize our understanding of the cosmos was the **telescope** [^3][^6][^8]....
What is used by stars to create new elements?
The raw material for almost everything around us—the calcium in our bones, the iron in our blood, and the oxygen we brea...
Can we use methane as rocket fuel?
The idea of using methane as a primary rocket propellant has moved from the realm of academic curiosity to the forefront...
What are two good reasons to use a ground-based telescope instead of a space telescope?
The image of a gleaming space telescope, floating silently above the clouds, often captures the public imagination as th...
What type of tools do scientists use?
The equipment scientists employ spans an astonishing spectrum, ranging from simple implements first used millennia ago t...