Science

Absolute magnitude refers to a measure of the real brightness of a star. In terms of absolute magnitude, a blue-violet star is classified as bright, while an orange-red star is classified as faint.

In accordance with their mass.

More massive stars by default are bluer and burn more quickly, go supernovae and can become a black hole or neutron star, depending on it's mass. Less massive stars are redder, last longer because they don't burn their fuel as furiously and don't go supernovae and don't become really dense stars after their "shed" their outer layer like the bigger ones do.

There is even a category of 'failed stars', which is when a gas giant didn't get big enough to to activate nuclear fusion in its core. Jupiter is in this category. If it had been a bit bigger, it would have been another sun.

The earliest recorded actual use of a magnetized needle for navigational purposes is found in Zhu Yu's book Pingzhou Table Talks (萍洲可談; Pingzhou Ketan) of 1119 (written from 1111 to 1117): The navigator knows the geography, he watches the stars at night, watches the sun at day; when it is dark and cloudy, he watches the compass.

Shadows point to the east during early morning hours (around sunrise) and late afternoon hours (around sunset) when the sun is located in the west. At these times, the sun is positioned low in the sky, causing objects to cast shadows that extend towards the east.

Nimbostratus clouds typically bring prolonged precipitation, such as rain or snow. They are often associated with overcast skies and can produce light to moderate continuous precipitation over a wide area.

Moon sand is a type of toy sand that sticks together because it is coated with a special substance like dimethicone. This coating reduces the friction between the sand particles, allowing them to move more freely and stick together easily when squeezed or molded.

A vorticella lives in freshwater environments, attaching itself to substrates such as plants, algae, or debris. They can be found in ponds, lakes, and streams where there is plenty of organic matter for them to feed on.

Alpha Capricorni, also known as Algedi, is a binary star system. The primary star, Alpha Capricorni A, has a surface temperature estimated to be around 4,900 degrees Celsius. The secondary star, Alpha Capricorni B, has a lower surface temperature of around 3,700 degrees Celsius.

Christopher Columbus's goal was to find a new, western route to Asia for trade and exploration. He believed that by doing so, he could acquire wealth and spread Christianity. This promise of increased trade and potential riches convinced King Ferdinand and Queen Isabella to fund his journey.

It is not possible to travel to the sun by car. The distance between Earth and the sun is about 93 million miles, and even if you could drive at the speed of light, it would still take over 8 minutes to reach the sun.

Tycho Brahe made major contributions to the field of astronomy with his observations of planetary motion and inventions of astronomical instruments to make those observations. The data he collected ultimately contributed to supporting the heliocentric theory of the solar system - which he didn't believe in. Further details and facts on Brahe can be found at the related link below.

The size of a shadow is affected by the angle and intensity of the light source, the distance between the object and the light source, and the size and shape of the object. The position of a shadow is influenced by the relative positions of the light source, the object, and the surface on which the shadow falls.

Sunshine duration is typically measured using a device called a sunshine recorder, which consists of a glass sphere that focuses sunlight onto a piece of paper. The recorder marks the duration of sunshine each day by burning a trace onto the paper. The length and intensity of the burn mark correspond to the amount of sunshine received.

The water droplets known as dew form when the air temperature passes below the "dew point" and water vapor condenses from the air onto the cooler objects. When cooled, air can no longer hold as much moisture.

Depending on their relative masses and velocities, the path of the smaller will be a circle, or more likely, an ellipse.

An old model for this is to consider a canon mounted at the top of the globe.

Firing a shell at moderate velocities, it will fall to Earth quite soon.

At a much higher velocity it will have sufficient energy to make a circle round the globe.

At higher velocities again, it will form an ellipse.

Eventually we reach escape velocity, where the shell just continues on a giant ellipse - really, an escape.

Steve Irwin was a scientist and did many things but mostly involving animals like he found anew species of turtles and named them after him self. he was nominated for the best Australian of the year awarded. sadly he died in 2006 he was killed by a sting ray the barbs of the sting ray is covered in ooze that if not treated immediately you can die in Steve Irwin case it was death that won this round.

The pH of fresh groundwater can slightly decrease upon exposure to air due to the absorption of carbon dioxide from the atmosphere. Carbon dioxide can dissolve in water to form carbonic acid, which lowers the pH of the water. This process is known as carbonation and can lead to a slight decrease in pH levels.

The large gaseous planet with the famous rings around it is Saturn. Its rings are composed of ice particles and debris, making it a unique and stunning feature of the planet.

The International Space Station (ISS) can be viewed from anywhere on Earth where the night sky is clear and the station is passing overhead. This can vary depending on the station's orbit and your location. Websites and apps like Spot The Station can help you track when the ISS will be visible from your specific area.

A satellite dish is just a reflecting surface to microwaves. As such, it has to be smooth compared to the wavelength of the microwave wavelength concerned. So any metal, (conducting surface) or even a metalized surface is OK. Otherwise it has to suit the manufacturing processes, and be suitable tor the physical environment in which it is erected. e.g. corrosion resistance, or snow and ice loading.

Box kites were first invented by Lawrence Hargrave, an Australian engineer, in the late 19th century. He designed and flew the first successful box kite in Stanwell Park, Australia in 1893. Since then, box kites have been used worldwide for various purposes, such as recreational flying and scientific research.

Concave lenses are used in glasses to correct nearsightedness (myopia) by diverging light before it reaches the eye. They are also used in cameras and projectors to spread out light rays, creating sharper images. Additionally, concave lenses can be used in certain scientific instruments to reduce the size of an image.

'You can't build a multi stage rocket unless you have about 3 billion dollars. But that's if your going to launch yourself. If you want to launch an item, it will cost you about 100,000 dollars!'

- first answer

yes, that is true if you were building a real rocket, but the question was 'How do you build a multi stage BOTTLE rocket?'

how i made mine for science class last year was:

i took a 2 liter bottle. then i cut another one up so that it looked like a cylinder with no top or bottom. i placed it on top of the upside down 2 liter, just placing it there, not attaching it. i then attached strings to that portion and attached a parachute to the strings. i folded the parachute up very softly and put it in the cylinder that is placed upon the upside down two liter. i then put a cone on top that is slightly too large so that you can press it down and make it snug, but it will fall off if flipped over. in the nose of the cone, i put playdoh to weigh it down. i also put playdoh on the bottom of the 2 liter, in the area that normally sits on the table, to weigh it down so that it falls off while in flight.

umm, i think that's about it.