The Insane Engineering of James Webb Telescope
The James Webb Space Telescope is a very advanced telescope designed to look back at the early universe. It cost 10 billion dollars and is launching on December 24th from French Guiana. It will not orbit Earth but will go to a special point in space called Lagrange point 2, about 1.5 million kilometers away, where it can stay stable and avoid heat from the Sun, Earth, and Moon. To work, its instruments need to be extremely cold, so it has a large, multi-layered sunshield made of special material that blocks heat, and a cryocooler for even colder temperatures. The sunshield is very complex to unfold in space and has features to prevent tears from micrometeorites. The telescope's main mirror is made of 18 gold-plated beryllium segments, which are lightweight and can adjust their shape very precisely to focus light. This big mirror is needed to collect faint light from distant objects. The telescope also has systems to keep it steady and thrusters for movement, but its mission is limited to 10 years because of fuel. The hope is that future large telescopes will be built and serviced in space.
Key Vocabulary
To be burned or discolored by intense heat, often to the point of damage.
Examples:
- The desert landscape looked scorched after weeks of extreme heat and no rain.
- If you leave the cookies in the oven too long, they will be scorched on the bottom.
- The old photograph was scorched around the edges from being too close to the fireplace.
Simple machines consisting of a wheel with a grooved rim over which a rope or chain can be passed to change the direction or magnitude of a force, used for lifting or pulling.
Examples:
- Construction workers used a system of pulleys to lift the heavy steel beams to the top of the building.
- The old well had a bucket attached to a rope that ran over a wooden pulley.
- To make raising the flag easier, the flagpole was equipped with a set of pulleys.
A wide, continuous area of something, typically land or sea.
Examples:
- From the mountaintop, we could see a vast expanse of forest stretching to the horizon.
- The calm ocean presented an endless expanse of blue under the clear sky.
- The company's new headquarters featured a large, open expanse of collaborative workspace.
Refers to specific points in space where the gravitational forces of two large bodies (like the Sun and Earth) precisely balance the centripetal force required for a smaller object to move with them, creating stable 'parking spots' for spacecraft.
Examples:
- The James Webb Space Telescope is positioned at a Lagrange point to minimize fuel consumption for station-keeping.
- Scientists are considering placing a space habitat at the L4 Lagrange point between the Earth and the Moon.
- Satellites at Lagrange points can maintain a relatively fixed position relative to the celestial bodies they orbit.
The process of making something stable or keeping it in a steady state, often by counteracting disruptive forces.
Examples:
- The ship's advanced gyroscopic system provided excellent stabilisation even in rough seas.
- Economic policies were introduced to achieve the stabilisation of the national currency.
- The engineers added extra supports for the structural stabilisation of the bridge.
To use or take advantage of an opportunity or resource.
Examples:
- Students should avail themselves of all the resources available in the university library.
- He decided to avail himself of the early bird discount before it expired.
- If you wish to avail yourself of the free shuttle service, please be at the designated pick-up point by 8 AM.
A metallic device, typically a rod or wire, that receives or transmits radio or television signals.
Examples:
- The satellite dish acts as a large antenna, capturing signals from space.
- He had to adjust the car's antenna to get better radio reception in the mountains.
- The new Wi-Fi router has multiple adjustable antennas for optimal signal coverage.
Making small adjustments or modifications to something in order to improve it or make it more effective.
Examples:
- The chef was in the kitchen, tweaking the recipe for the new dessert until it was perfect.
- Before the presentation, she spent an hour tweaking the slides to ensure everything was aligned.
- The software developer was constantly tweaking the code to enhance performance and user experience.
In a way that relates to sound or the sense of hearing; pertaining to the properties of sound.
Examples:
- The concert hall was designed acoustically to provide exceptional sound quality for every seat.
- The recording studio was acoustically treated to prevent echoes and external noise interference.
- The new headphones are acoustically engineered to deliver rich, clear audio.
A device used to ignite or set fire to something, typically a fuel.
Examples:
- The gas grill wouldn't light because the igniter was faulty.
- He used a small electronic igniter to start the campfire quickly.
- Rocket engines often use a specialized igniter to initiate combustion of propellants.
Relating to or involving the mechanical effects of electricity, or the conversion of electrical energy into mechanical energy, or vice versa.
Examples:
- The old cash register was an impressive electromechanical device, clunking and whirring as it calculated totals.
- Modern robots rely on complex electromechanical systems for movement and interaction.
- The automatic door opener uses an electromechanical mechanism to sense motion and activate the motor.
A substance, typically a fluid, used for cooling, often by undergoing phase changes (e.g., evaporation and condensation) in a refrigeration cycle.
Examples:
- The air conditioning unit needed to be refilled with refrigerant to cool the house effectively.
- Early refrigerators used ammonia as a refrigerant, but it was highly toxic.
- Engineers are developing new, environmentally friendly refrigerants for cooling systems.
Moving or tending to move toward a center; in physics, the force required to keep an object moving in a circular path.
Examples:
- The centripetal force of the Earth's gravity keeps the Moon in orbit.
- When a car turns a corner, the friction between the tires and the road provides the necessary centripetal force.
- The amusement park ride created a strong centripetal sensation as it spun rapidly.
In a manner that is surprisingly impressive or remarkable; astonishingly.
Examples:
- The new digital camera produces astoundingly clear images, even in low light.
- Despite his young age, the musician played the complex piece astoundingly well.
- The team completed the project in an astoundingly short amount of time.
Having six straight sides and six angles.
Examples:
- The beehive was made up of many hexagonal cells, perfectly interlocking.
- They chose a hexagonal tile pattern for the bathroom floor.
- The nut had a hexagonal shape, designed to be tightened with a wrench.
A type of rocket propellant that consists of a single chemical substance that, when decomposed, produces hot gas for thrust, without the need for a separate oxidizer.
Examples:
- Small thrusters on satellites often use a monopropellant for precise attitude control.
- Hydrazine is a common monopropellant used in spacecraft for its reliable decomposition.
- The design simplified the propulsion system by using a monopropellant instead of a bipropellant.
A chemical reaction or process that releases energy, typically in the form of heat or light.
Examples:
- The combustion of wood is an exothermic reaction, producing heat and light.
- When certain chemicals are mixed, an exothermic reaction occurs, causing the solution to warm up.
- The hand warmers use an exothermic process to generate heat when exposed to air.
Directed or channeled through a narrow passage or course, as if through a funnel.
Examples:
- All the incoming calls were funneled through a single customer service line.
- The crowd was funneled into the stadium through a series of gates.
- The company's profits were funneled into research and development for new products.
The transfer of heat by the circulation or movement of heated parts of a liquid or gas.
Examples:
- A hot air balloon rises due to the principle of convection.
- Convection currents in the ocean influence global weather patterns.
- The oven uses convection to cook food more evenly by circulating hot air.
Relating to the philosophical doctrine that all events, including human action, are ultimately determined by causes external to the will; in engineering, a system whose future states are entirely determined by its current state and inputs, without randomness.
Examples:
- The robot's movements were perfectly deterministic, following its programmed instructions without deviation.
- In a deterministic system, if you know the initial conditions, you can predict the outcome with certainty.
- The computer algorithm was designed to be deterministic, always producing the same output for the same input.