Tag: science & technology

This statement is accurate. The lethal dose of caffeine is extremely high - approximately 80-100 cups of coffee consumed rapidly would provide enough caffeine (10-13 grams) to be fatal to an average adult. This explains why caffeine overdose deaths are extremely rare under normal consumption patterns.

Caffeine works by blocking adenosine, a sleep-inducing chemical, from binding to nerve receptors in the brain. Adenosine normally accumulates during the day and makes us feel tired. By blocking adenosine receptors, caffeine prevents this fatigue signal and promotes wakefulness. Dopamine and oxytocin are not blocked by caffeine.

The Hubble Deep Field images show galaxies stretching to the visible horizon of the universe, revealing thousands of galaxies in what appeared to be empty space. Option A is incorrect because it doesn't show the Milky Way - it points away from our galaxy's plane. Option C is incorrect because it shows far more than just our local group.

Titan (Option C) is Saturn's largest moon, not a nebula. Cat's Eye, Tarantula, and Eagle are all well-known nebulae - Cat's Eye is a planetary nebula, Tarantula is a massive star-forming region, and Eagle Nebula is famous for the 'Pillars of Creation'.

Algol, known as the 'Demon Star', is actually a triple star system consisting of three stars: Algol A, Algol B, and Algol C. While it was traditionally thought to be a binary (two-star) system, recent astronomical findings have revealed the third component, making it a triple system.

Our Solar System is located in the Orion Arm (also called Orion Spur), a minor spiral arm of the Milky Way galaxy. The Orion Arm lies between the larger Sagittarius Arm and Perseus Arm. It's about 3,500 light-years across and 10,000 light-years long.

Halley's comet has a well-documented orbital period of approximately 76 years. The last appearance was in 1986, and the next is expected in 2061. This regular pattern makes it predictable for astronomers to track its appearances.

The Big Bang theory is the most widely accepted scientific explanation for the origin of the Universe. It describes how the Universe expanded from an initial hot, dense state approximately 13.8 billion years ago. The theory is supported by evidence like cosmic microwave background radiation and the observed expansion of galaxies.

Hawking radiation is theoretical blackbody radiation emitted by black holes due to quantum effects near the event horizon. Particle-antiparticle pairs form just outside the horizon; one falls in while the other escapes as radiation, carrying away energy from the black hole.

The Milky Way is a barred spiral galaxy, meaning it has a central bar-shaped structure of stars with spiral arms extending from the bar's ends. This structure has been confirmed by observations of star distributions and gas motion.