- How many galaxies are they?
- Why do stars die?
- What are some fun facts about stars?
- What are 3 interesting facts about galaxies?
- What are the two most interesting things that you learned about stars and constellations?
- Is the sun black?
- Are black holes?
- How old is the Galaxy?
- Why do stars twinkle?
- What do stars tell us?
- What’s the most beautiful star?
- Why do stars have 5 points?
- What’s the Sun’s real name?
- What are the 7 types of stars?
- What is the purpose of the stars?
How many galaxies are they?
The deeper we look into the cosmos, the more galaxies we see.
One 2016 study estimated that the observable universe contains two trillion—or two million million—galaxies..
Why do stars die?
Stars die because they exhaust their nuclear fuel. … Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
What are some fun facts about stars?
Top 10 cool things about starsEvery star you see in the night sky is bigger and brighter than our sun. … You can’t see millions of stars on a dark night. … Red hot and cool ice blue – NOT! … Stars are black bodies. … There are no green stars. … Our sun is a green star. … Our sun is a dwarf star. … Stars don’t twinkle.More items…•
What are 3 interesting facts about galaxies?
Galaxies can range in size from a dwarf with as few as ten million stars to massive giant galaxies with a hundred trillion stars….Galaxy FactsSpiral galaxies are disk-shaped with dusty, curving arms.Irregular galaxies have an unusual or irregular shape.An elliptical galaxy, has an ellipse-shaped light profile.
What are the two most interesting things that you learned about stars and constellations?
Here’s a list of 10 interesting facts about stars; some you might already know, and few that are going to be new.The Sun is the closest star. … Stars are made of the same stuff. … Stars are in perfect balance. … Most stars are red dwarfs. … Mass = temperature = color. … Most stars come in multiples.More items…•
Is the sun black?
The Sun, with an effective temperature of approximately 5800 K, is an approximate black body with an emission spectrum peaked in the central, yellow-green part of the visible spectrum, but with significant power in the ultraviolet as well.
Are black holes?
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
How old is the Galaxy?
13.51 billion yearsMilky Way/Age
Why do stars twinkle?
The movement of air (sometimes called turbulence) in the atmosphere of Earth causes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. … To our eyes, this makes the star seem to twinkle.
What do stars tell us?
The spectrum of a star can tell us the temperature, size, and composition of the star. It can also tell us how fast it is moving. If there are two stars in orbit around each other, a series of measurements can be used to get their masses (weights). … Most of what we know about stars has been learned from their spectra!
What’s the most beautiful star?
Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth’s night sky. The name means “glowing” in Greek — a fitting description, as only a few planets, the full moon and the International Space Station outshine this star.
Why do stars have 5 points?
Some cultures also represented stars more like they are seen in the sky, as dots, or small circles. The 5 pointed star might have originated from the way the Egyptians represented the star in hyroglypics. If you look at a really bright star sometime you might notice that it does appear to have lines coming out from it.
What’s the Sun’s real name?
SolisThe sun doesn’t have a scientific name, it is sometimes called Sol. Solis is Latin for sun; Sol is the Roman equivalent of the Greek sun God Helios.
What are the 7 types of stars?
Stars are classified by their spectra (the elements that they absorb) and their temperature. There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim..
What is the purpose of the stars?
By convention, astronomers grouped stars into constellations and used them to track the motions of the planets and the inferred position of the Sun. The motion of the Sun against the background stars (and the horizon) was used to create calendars, which could be used to regulate agricultural practices.