# What is the angle of reentry of the space shuttle?

Descent through atmosphere: After it’s safely out of orbit, the shuttle turns nose-first again and enters the atmosphere belly-down (like a belly-flop) to take advantage of drag with its blunt bottom. Computers pull the nose up to an angle of attack (angle of descent) of about 40 degrees.

Consequently, why is there heat on reentry?

Direct friction upon the reentry object is not the main cause of shock-layer heating. It is caused mainly from isentropic heating of the air molecules within the compression wave. Friction based entropy increases of the molecules within the wave also account for some heating.

How hot is the space shuttle on re entry?

The Space Shuttle thermal protection system (TPS) is the barrier that protected the Space Shuttle Orbiter during the searing 1,650 °C (3,000 °F) heat of atmospheric reentry. A secondary goal was to protect from the heat and cold of space while in orbit.

How fast is the space shuttle when it lands?

The orbiter’s main landing gear touches down on the runway at 214 to 226 miles per hour, followed by the nose gear.

## Can astronauts cry in space?

Astronauts don’t cry: Chris Hadfield shows tears in space. Astronaut Chris Hadfield explains what it’s like to cry in space. There’s no crying in baseball, and now there’s no crying in space. While the zero gravity atmosphere does not have an impact on tears forming, it has an affect on if they fall, and they don’t.

## What is the true color of the sun?

However, the Sun is essentially all colors mixed together, which appear to our eyes as white. This is easy to see in pictures taken from space. Rainbows are light from the Sun, separated into its colors. Each color in the rainbow (red, orange, yellow, green, blue, violet) has a different wavelength.

## Is the Sun a green star?

So as far as the human eye can tell, there are no green stars. 6. Our sun is a green star. That being said, the sun is a “green” star, or more specifically, a green-blue star, whose peak wavelength lies clearly in the transition area on the spectrum between blue and green.

## Is there a green sun?

Any star emitting mostly green will be putting out lots of red and blue as well, making the star look white. Changing the star’s temperature will make it look orange, or yellow, or red, or blue, but you just can’t get green. Our eyes simply won’t see it that way. That’s why there are no green stars.

## Why does the moon look white?

The only reason it appears white to us on Earth is because when the sun is behind us, the reflection from the sun lights the moon up. But what makes it GRAY is the rocks & dust found on the moon. The moon is like one giant asteroid floating around Earth, made completely of rocks.

## What is the coolest color of a star?

Since the temperature of a star can determine its visual color, this category scheme is known as spectral type. The main categories of spectral type are M, K, G, F, A, B, and O. The coolest stars (red dwarfs) being M, and the hottest stars being O. Our own Sun is a G star.

## Which is the coldest star?

The hunt for cool objects in the cosmos is an active field of astronomy. NASA’s Spitzer Space Telescope recently identified two other very faint objects as other possible contenders for the coldest known brown dwarfs, but the temperatures of these stars have not been measured as precisely.

## What is the coolest star in the universe?

Astronomers Find Coldest Star in the Universe. Astronomers have detected a new candidate for the coldest known star — one whose temperature is roughly equivalent to a fresh cup of tea. The object is part of a double system and is a type of star known as a brown dwarf, which is essentially a failed star.

## What is the youngest star in the universe?

The Universe’s Youngest Star is Born. Call it slapping hydrogen gas on its proverbial butt. A team of American and German astronomers has announced its observation of the youngest known stellar object ever, according to a paper published in the most recent issue of The Astrophysical Journal.

## Which color is the hottest star?

You can tell the approximate temperature of a star by looking at its color. The coolest stars are red, then orange, then yellow (like our Sun). Even hotter stars are white and then the hottest stars are blue! The surface temperature of our sun is 5777 Kelvins (~5000 degrees C or ~ 9940 degrees F).

## Which is the smallest star?

The smallest known star right now is OGLE-TR-122b, a red dwarf star that’s part of a binary stellar system. This red dwarf the smallest star to ever have its radius accurately measured; 0.12 solar radii. This works out to be 167,000 km. That’s only 20% larger than Jupiter.

## What is the color of the coldest star?

Our Sun is a type G star, which are yellow stars with surface temperatures of about 6000 °C, or 11,000 °F. Type A stars, which are hotter, are white in color and maintain temperatures of around 10,000 °C or 18,000 °F. The hottest of the types, B and O, are blue stars while the coolest of type M are red in color and

## What is the hottest star in the universe?

Eta Carinae could be as large as 180 times the radius of the Sun, and its surface temperature is 36,000-40,000 Kelvin. Just for comparison, 40,000 Kelvin is about 72,000 degrees F. So it’s the blue hypergiants, like Eta Carinae, which are probably the hottest stars in the Universe.

## What happens when a star exhausts its fuel?

Smaller stars will live on for billions of years because they burn their fuel much more slowly. Eventually, the star’s fuel will begin to run out. It will expand into what is known as a red giant. This phase will last until the star exhausts its remaining fuel.

## What is left behind after a supernova?

The explosion will be so big that we elevate it from the status of a normal nova to a supernova, the death of a very massive star. The remnants of the stellar core which are left after the supernovae explosion will follow one of two paths: neutron star or black hole.

## What is the brightest star in the universe?

The brightest star in the sky is Sirius, also known as the “Dog Star” or, more officially, Alpha Canis Majoris, for its position in the constellation Canis Major. Sirius is a binary star dominated by a luminous main sequence star, Sirius A, with an apparent magnitude of -1.46.

## Which is the biggest known star?

VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. With a size of 2600 solar radii, it is the largest known star and also one of the most luminous known. It is located about 1.5 kiloparsecs (4.6×1016 km) or about 4,900 light years away from Earth.

## Which is the brightest constellation?

Procyon is currently twice the diameter of the Sun, one of the largest stars within 20 light-years. Canis Major can be found fairly easily east of Orion during northern-hemisphere winter. Procyon, along with Sirius and Betelgeuse, form the Winter Triangle asterism.

## Is the North Star and Sirius the same?

Firstly, you might expect one of the most famous stars in the night sky to be one of the brightest, but it isn’t; not by a long shot. That honor belongs to Sirius and many less bright stars besides. The North Star shines with a humble brightness that belies its navigational importance.

## Is Polaris brighter than the sun?

For a long time now, we have known that this single point of light was actually a binary star, Polaris A and B. The main star that we see, Polaris A, is a yellow-white giant star about six times heavier, 2.5 times larger and 2500 times brighter than our Sun.

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