0
Science
The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.
203,801 Questions
Where would you end up if you followed a compass needle to the north?
If you followed a compass needle pointing north, you would eventually end up at the North Pole, the point on Earth's surface that lies at 90 degrees north latitude.
What planet has a moon called Phoebe?
Saturn has a moon called Phoebe. It is the largest of Saturn's irregular moons and orbits the planet in a retrograde direction, meaning it travels opposite to the planet's rotation. Phoebe is heavily cratered and has a dark surface, suggesting it may be a captured object from the outer solar system.
What fibers surrounds the xylem and phloem?
The xylem and the phloem tissues are found in plants. Bast fibers surround the xylem and the phloem tissues in plants.
As of October 2021, Jim Lovell is alive. He was born on March 25, 1928, and is a retired astronaut who is best known for his role as the commander of the Apollo 13 mission.
When was the universe discovered?
In 1929 Edwin Hubble, working at the Carnegie Observatories in Pasadena, California, measured the redshifts of a number of distant galaxies. He also measured their relative distances by measuring the apparent brightness of a class of variable stars called Cepheids in each galaxy. When he plotted redshift against relative distance, he found that the redshift of distant galaxies increased as a linear function of their distance. The only explanation for this observation is that the universe was expanding.
Once scientists understood that the universe was expanding, they immediately realized that it would have been smaller in the past. At some point in the past, the entire universe would have been a single point. This point, later called the big bang, was the beginning of the universe as we understand it today.
The expanding universe is finite in both time and space. The reason that the universe did not collapse, as Newton's and Einstein's equations said it might, is that it had been expanding from the moment of its creation. The universe is in a constant state of change. The expanding universe, a new idea based on modern physics, laid to rest the paradoxes that troubled astronomers from ancient times until the early 20th Century.
Properties of the Expanding UniverseThe equations of the expanding universe have three possible solutions, each of which predicts a different eventual fate for the universe as a whole. Which fate will ultimately befall the universe can be determined by measuring how fast the universe expands relative to how much matter the universe contains.
The three possible types of expanding universes are called open, flat, and closed universes. If the universe were open, it would expand forever. If the universe were flat, it would also expand forever, but the expansion rate would slow to zero after an infinite amount of time. If the universe were closed, it would eventually stop expanding and recollapse on itself, possibly leading to another big bang. In all three cases, the expansion slows, and the force that causes the slowing is gravity.
A simple analogy to understand these three types of universes is to consider a spaceship launched from the surface of the Earth. If the spaceship does not have enough speed to escape the Earth's gravity, it will eventually fall back to Earth. This is analogous with a closed universe that recollapses. If the spaceship is given enough speed so that it has just enough energy to escape, then at an infinite distance away from the Earth, it will come to a stop (this is the flat universe). And lastly, if the ship is launched with more than enough energy to escape, it will always have some speed, even when it is an infinite distance away (the open universe).
Liquid glass is a compound often made of silica, oxygen, sodium, and other components that forms a transparent, glass-like film when applied on surfaces. It is known for its waterproof, durable, and heat-resistant properties, making it useful for protecting various materials such as glass, metal, and ceramics.
Clementine was the name of an unmanned space vehicle launched as a joint project by NASA and the Strategic Defense Initiative Organization (funding was by NASA and the US Navy). Its 1994 mission was in large part a test of the effects of long-term deep-space exposure on the spacecraft and its sensors, but its best-known contribution was the first up-close and extensive surveying of the surface of the moon.
It made headlines when its survey of the lunar south pole strongly suggested the possibility of water ice on the moon, a theory backed up by the later Lunar Prospector at the lunar north pole, and confirmed by the 2009 Lunar Reconnaissance Orbiter's analysis of material ejected from a shadowed crater after a deliberate impact by the accompanying LCROSS vehicle.
Clementine was also notable for being among the first of NASA's "faster, smaller, cheaper" unmanned missions. This paved the way for a new string of unmanned missions to the moon and Mars during the 1990s-2000s.
Leeches are from the subclass Hirudinea and a kind of segmented worm but differ in significant ways. Leeches eat a prey on small invertebrates, and they use their interior suckers to feed on their host.
What will produce a physical change in one substance and a chemical change in another substance?
A physical change simply alters the shape, size, color and physical state (solid, liquid, gas, plasma state) of a material. Melting ice, boiling water, freezing water, mixing sulphur with iron filings, and even tearing paper will produce physical change. Composition of a substance remains unchanged in case of a physical change.
A chemical change involves the breaking of old bonds and the creation of new bonds that hold particles (atoms, molecules) together. In this, a new substance is formed. Rusting of an iron, the formation of white ash of MgO when magnesium wire burns are examples of chemical change.
A physical change can be reversed by using physical processes such as evaporation, crystallization, distillation, etc; whereas a chemical change can't be reversed using physical processes.
What was the name of the first spacecraft to and on the moon?
First craft to the Moon (flyby): Russia's Luna 1, January 1959 First craft to the Moon and crash: Russia's Luna 2, September 1959 First craft to the Moon and land: Russia's Luna 3, October 1959 First manned mission circling the Moon: USA's Apollo 8, December 1968 First manned mission on the Moon: USA's Apollo 11, July 1969
Whast was the name of the first spacecraft to land on earth?
The first spacecraft carrying a human to land safely was Vostok 1 carrying cosmonaut Yuri Gagarin.
Is ytterbium natural or man made?
Ytterbium is a naturally occuring rare earth element. However, an isotope of Ytterbium (Ytterbium-169) is an artificially produced isotope.
How much force is needed to push moon out of orbit?
The force required to push the moon out of its orbit would depend on the velocity of the moon and its distance from Earth. It would be an extremely large force, likely beyond our current technological capabilities. Additionally, any attempt to move the moon out of its orbit could have significant consequences for Earth's tides and climate.
How was our solar system part of a star?
One of the theories about how the solar system was created is that a small part of a giant molecular cloud somehow collapsed, creating an excess of gravity. It condensed in the middle, forming the sun, and the rest of the new solar system formed into a disk. The gravity of the newly created sun then drew asteroids and gases which then collided together to become larger. The sun then gave off a lot of solar wind (because it was newly made; it was very strong) and the inner planets were stripped of their gaseous outer layer. the outer planets, however, were not because they were further away.
This happened about (scientists estimate) 4.6 billion years ago.
this is not the same person but if you ask me i say there was the big bang theory and what caused that was a small dot in the middle of nothing and it contained everything all matter and reality it doesnt sound likely but that's how the prediction went anyway the dot suddenly exploded and sending out all kinds of galaxys and stars the big bang was a very hot explosion it went up to 5000000000 degrees celcius and that's how it formed sending out the galaxies and which the galaxies are constantly moving away from each other from the energy left from the big bang.
What very large organic compound made up of chains of smaller molecules?
A very large organic compound made up of chains of smaller molecules is a polymer. Polymers are macromolecules formed by repeating units of smaller molecules called monomers. Examples of polymers include proteins, DNA, and synthetic plastics.
How do you transfer electromagnetic radiations into chemical energy?
There are a couple of ways of converting electromagnetic energy (sunlight) into chemical energy.
First, grow plants. The chlorophyll in the plants convert sunlight and water into plant matter. Trees grow into wood, olive trees can be harvested for oil, and almost any kind of vegetable matter can be converted into alcohol.
Second, use a solar power cell to charge a battery.
How can you compare the benefits of living on earth and the moon?
no body has ever lived on the moon.its a barren, small wasteland with no atmosphere. it has only one sixth of the earths gravity which means we can jump really far and high and lift weights which is six times heavier.other than that you can do anything that you do normally on earth so basically its no fun at all
What are the advantages and disadvantage of right realism?
Advantages: Right realism emphasizes the role of individual responsibility for crime, highlights the importance of controlling crime through effective policing and punishment, and promotes practical crime prevention measures.
Disadvantages: Critics argue that right realism neglects broader social factors that contribute to crime, such as poverty and inequality, and focuses too heavily on punishment rather than prevention. It can also lead to increased levels of surveillance and control, which may infringe on civil liberties.
Which way is the northern hemisphere tilted during the summer?
The northern hemisphere is tilted towards the sun during the summer, which results in longer days, higher temperatures, and more direct sunlight. This tilt is what causes summer in the northern hemisphere.
Eyelashes help protect our eyes by detecting and preventing foreign objects from entering, such as dust and debris. They also help to reduce the amount of sunlight that enters our eyes, which can help improve vision and reduce glare. Additionally, eyelashes play a role in sensitivity and communication through blinking.
How was the calendar year developed?
Well when it was a long time ago a man said " If we got diary's we should have something that goes on the wall and we should put little pictures to tell us , if its a special day and we should have large pictures to it " and wala he made a calender out of paper paint colours and more. By India123girl does that answer your question.
Does every shuttle make the sonic boom during re entery?
The sonic boom is an artifact of exceeding the speed of sound. As any shuttle would reenter earth's atmosphere way in excessive of that speed, yes, every reentry should be accompanies by a sonic boom.
Do jaguars migrate or hibernate?
Jaguars do not migrate like some bird or mammal species that travel long distances seasonally. They are also not known to hibernate. Jaguars are solitary animals that roam over large home ranges to find food and maintain their territory.
How can you identify if its a waning or waxing moon?
The Moon's phases grow from right to left in the NorthernHemisphere, backwards to how we - in the West - read. So the Waxing Moon begins on the right side of the moon. And the Waning Moon ends on the left side. But how can you remember this easily?
Here's a simple way to determine whether the moon is waxing or waning.
Steps- Flatten your right hand, with your fingers together and your thumb sticking out.
Waxing Crescent
- Hold your hand out at arm's length in front of you. Tilt your thumb towards the ground.
- See how the line along your thumb and first finger makes a curve, roughly like a backwards letter "'C'"? It actually looks sort of like this: ) This is the shape of the Waxing Moon. If the Moon's curve fits along this right-hand curve, it is a Waxing Moon.
- Commit it to memory. One way to remember this is to think of drawing in wax. Most people are right-handed, and if they were to draw in wax, they'd use their right hand. So if the Moon fits in your right-hand curve, it is waxing.
- Do the same with the left hand. This makes a shape like this: (
This is the shape of the Waning Moon. If the moon fits in this curve, you know it is getting smaller every day, going toward the new moon / dark moon.
Watch it for about a week. If it gets smaller, it is waning; if it gets larger, it is waxing.
Be aware that (in the north) the shadow moves across the moon from our right to our left. You can tell from this how the phase is advancing.
