Tag: science & technology

'Breakbone fever' is a traditional name for dengue fever, referring to the severe joint and muscle pain it causes. Dengue is a mosquito-borne viral disease prevalent in tropical and subtropical regions, transmitted by Aedes mosquitoes, unlike malaria (caused by Plasmodium parasites), typhoid (bacterial infection), or tuberculosis (bacterial lung infection).

The Milky Way galaxy has a spiral shape, specifically a barred spiral galaxy. It consists of a central bar-shaped structure with spiral arms extending outward. The disc shape (option A) is partially correct but incomplete - it's specifically a spiral disc, not a flat disc. Circular and irregular are incorrect classifications for the Milky Way.

Drake's Equation is N = N* × fp × ne × fl × fi × fc × fL, used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. It was formulated by astrophysicist Frank Drake in 1961. Option B is Fermat's Last Theorem (proven by Andrew Wiles). Option C is related to the Golden Ratio. Option D is not a standard equation.

A light year is a unit of distance, specifically the distance that light travels in one vacuum year (approximately 9.46 trillion kilometers or 5.88 trillion miles). It is commonly used to measure astronomical distances. Students often confuse it with a unit of time because of the word 'year' in the term, but it measures distance, not time.

Light takes approximately 1.28 seconds to travel from the Moon to Earth. The average Earth-Moon distance is about 384,400 km, and light travels at about 300,000 km/s. Calculating: 384,400 ÷ 300,000 ≈ 1.28 seconds. The other options are incorrect - 8.1 minutes is the time for light from the Sun, 3.2 seconds is too short, and 2.3 minutes is too long.

VY Canis Majoris is a red hypergiant star with one of the largest known radii, approximately 1,420 times that of the Sun. While recent discoveries like UY Scuti may be larger, VY Canis Majoris remains among the largest stars known. Aldebaran and Arcturus are much smaller giant stars, and Antares, while large, is smaller than VY Canis Majoris.

Fred Hoyle coined the term 'Big Bang' during a 1949 radio broadcast as a sarcastic description of the theory he opposed. Ironically, his mocking term became the permanent name for the theory. Georges Lemaître proposed the expanding universe theory (the 'primeval atom' hypothesis), but Hoyle created the famous name we use today.

Apollo-11 was the NASA mission that first landed humans on the Moon on July 20, 1969. Neil Armstrong and Buzz Aldrin became the first humans to walk on the lunar surface while Michael Collins orbited above in the command module. Saturn V was the powerful rocket that launched Apollo-11, not the mission name itself.

Laika, a stray dog from Moscow, became the first animal to orbit Earth aboard Sputnik 2 on November 3, 1957. The Soviet space program used dogs for early spaceflight experiments. Laika's mission was tragically one-way as reentry technology had not been developed yet.

For massive red giants, the next evolutionary stage is a supernova explosion. When a red giant exhausts its nuclear fuel, the core collapses and the outer layers are explosively ejected, creating a supernova. The remnant core may become a neutron star or black hole, while lower-mass red giants become planetary nebulae and white dwarfs.