Galaxies

That sounds like the description of an elliptical galaxy.

In about 26000 year.

The Milky Way Galaxy probably started to form about 13.2 billion years ago, and has been forming ever since. It will continue to evolve for billions, if not trillions of years from now.

Our galaxy has over 200 billion stars; many of them do have planets, and thus qualify as a "solar system".

As to the total number, we will never know, as solar systems will live and die.

As a rough guess, at least 50% of all stars should have planets - so that could be classified as a "Solar System".

Our Universe is bigger, than a galaxy.

I said WHERE?!

We determine the types of elements contained in the star or within the corona by analyzing the spectrum of the light we receive. Each element will radiate at a set of specific discreet frequencies, and the frequencies they radiate tell us what the element is, and how deeply ionized it is. The spectral analysis is exact; we can even determine the proportions of the elements that we see by the relative brilliance of their light.

But there IS one thing that the spectrum cannot tell us; is this a normal matter star, or an anti-matter star?

It only works in one direction- moving to the future at the rate of 1 day per day. It does not work in reverse, and you cannot speed it up.

None, it is a group of independent airlines.

Radar can only be used for planets close to us in the solar system and the planet or object must be able to reflect the wave back. Radar cannot be used to measure the distance between Earth and the Sun because the sun doesn't reflect the radio waves back.

Sprials are visible because of light reflecting our eyes in a certain way. Spirals are hallucinations, that our eyes perceive.

Look in the discussion for the answers and choose one!

That sounds like a description of a galaxy.

On the way to Mars you will see all the constellations that you can see from Earth, but they will all be visible 24 hours a day (except the ones that are blocked by the Sun).

Because the stars are all much further away than Mars, the constellations will look exactly the same.

The 100 billion galaxies are an estimate for the number of galaxies in the observable Universe. The current estimate is a bit larger, around 170 billion. Nobody has actually counted all of them, much less mapped all their coordinates - and I don't this will be done any time soon.

The Milky Way, parts of which we can see from Earth curving around us.

T Tauri stars are pre-Main Sequence stars which are large but not as hot as O and B Main Sequence stars. They mainly fall in the categories of F, G, K or M, and they are not yet on the Main Sequence because they are still accreting mass and are still very young and unstable.

It is (kind of) - I believe such anthropomorphic analogies to be misleading and inappropriate; i.e. black holes do not eat. Instead the immense gravitational forces of a black hole tend to attract and compact all matter. And this is currently happening with the black hole at the center of our Milky Way galaxy.

Note: Such misleading imagry presents an inaccurate perspective of cosmological interactions. The misunderstood consideration of matter being engulfed into a hole and deficated as Hawking radiation presents a fictional consideration of natural forces, similar to the deification of nature to identify with mythological deities.

Variable, as an ellipse is not a perfect circle.

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Mating. If you even know what Hubble's Law is you know the answer to this question.

Hubble discovered that the nebulas were galaxies based on the powerful telescope at Mt Wilson. The second discoveries was the red shift relationship v=HD shows that the galaxies were outside our own galaxies definitely and quantitatively, using light sources in galaxies that were standard sources that could calibrate the distance.

The Milky Way can be seen in the night sky throughout the year. At any one point in time, at least part of the Milky Way will be visible in the night sky. The centre of the Milky Way can be best viewed from the southern hemisphere, and the outer arm (the Perseus Arm) is best seen from the northern hemisphere.