kayla+and+daniel

space

why isn't pluto a planet anymore? Pluto is not a planet anymore because it is to small to be a planet. Its orbit around the sun is all messed up. Over forty objects have been found that are similar to Pluto. The IAU’s position is that calling all these objects major planets is excessive, particularly as there are probably a great many more of these objects yet to be discovered. [|(i got this from)].

Why do scienticst think there is life on mars? For one, millions of people have seen ufo's that are not of earths technology. Scientists of Nasa and Stanford University (California) have found evidence for fossil life in a Martian rock. This so-called **SNC meteorite** had been ejected into space by an asteroid impact on Mars about 15 million years ago, and travelled around the Sun on an elliptical orbit on its own, as a miniture planet, until it impacted in an antarctic ice field about 13,000 years ago, where it was found in 1984. It was labelled "**Allen Hills 84001**" or "**ALH 84001**". [|(information from)]

How many galaxies are there? There are about [|50 billion galaxies.]In a previous FAQ, I mentioned that a recent Hubble Space Telescope image revealed that there may be over 50 billion galaxies or more in our visible universe. Most of these are very small and faint and would look like the Magellanic Clouds if we could see them up close. The Hubble Deep Field image shows hundreds of galaxies in a region of the sky only an arcminute across; about 1/30 the diameter of the full moon. If this spot of the sky is typical, you can easily estimate how many galaxies there are: There are 42,000 square degrees over the full sky, and 60x60 = 3600 spots as big as the Hubble Deep Field per square degree, so the total galaxies is about 3600 x 42,000 x 200 = 3.6 x 4.2 x 2 billion or about 40 billion. In our Local Group there are about thirty galaxies, of which only five would be visible at the distance probed by the Hubble Deep Field. This means we have to multiply 40 billion by about 6 to account for these smaller galaxies. That gives us an estimate of about 240 billion galaxies in our visible universe. I think if you asked me this question in a year from now, I would come up with about the same kind of estimate!

What is a black hole? According to Einstein's theory of general relativity, a **black hole** is a region of space in which the [|gravitational field] is so powerful that nothing, including [|electromagnetic radiation] (e.g. [|visible light]), can escape its pull after having fallen past its [|event horizon]. The term derives from the fact that absorption of visible light renders the hole's interior invisible, and indistinguishable from the black [|space] around it. Despite its invisible interior, a black hole may reveal its presence through interaction with matter orbiting the event horizon. For example, a black hole may be perceived by tracking the movement of a group of stars that orbit its center. [|(From)]

What is a super nova? If you ask me they are pretty. A **supernova** (plural: //supernovae//) is a [|stellar] [|explosion]. They are extremely luminous and cause a burst of radiation that often briefly outshines an entire [|galaxy], before fading from view over several weeks or months. During this short interval, a supernova can [|radiate] as much [|energy] as the [|Sun] could emit over its life span.[|[][|1][|]] The explosion expels much or all of a star's material[|[][|2][|]] at a velocity of up to a tenth the [|speed of light], driving a [|shock wave][|[][|3][|]] into the surrounding [|interstellar medium]. This shock wave sweeps up an expanding shell of gas and dust called a [|supernova]. [|(from)]

What is a lunar eclipse. A lunar eclipse is when the moon is behind the earth. On the moon it is really dark then. This is because the full moon passes through Earths shadow. When earth is inbetween the moon and the sun wich blocks the suns light. The earths atmosphere is usally the color red then. This makes the moon look like an eliptical red circle.

what are stars? A [|star] is a ball of gas held to together by it's own gravity. The force of gravity is continually trying to cause the star to collapse. This is counteracted by the pressure of the hot gas and/or radiation in the star's interior. This is called hydrostatic support.

What is a meteor? [|Meteor]s are big balls of gas and rock. Some times they hit earth and leave a big impact. They fly through out space. Some times they are from other planets or moons. While meteors can often be seen any night, there are certain times of year where the rate of visible meteors is much higher. Commonly occurring every year or so, a meteor shower or meteor storm can be predicted right down to the peak viewing hours.\