Astronomy quizlet chapter 12

How old is our planet Earth quizlet?
The Earth is approximately 4.6 billion years old..
What are Gabe's sleeping habits?
What are Gabe's sleeping habits in The Giver Chapter 12? Gabe has a hard time sleeping in Jonas' home.
His sleeping pattern contrasts with Jonas' sleeping, which the latter describes as deep and peaceful..
What is the main sequence astronomy quizlet?
Main sequence stars are stars that are fusing hydrogen atoms to form helium atoms in their cores..
What is the name for the tools astronomers use that collect as much light as possible from an astronomical source and focuses it down to a narrow beam to form an image?
All telescopes are collectors of light.
Some telescopes collect and focus light using a lens that light passes through.
Such telescopes are called refractors.
Other telescopes use a mirror from which light is reflected, and such telescopes are called reflectors..
What may happen to a star that is 8 to 20 times the mass of the sun?
A high mass star (between 8 and 20 times the mass of the Sun) also first becomes a red supergiant and sheds its outer layers.
The core of the star collapses violently in on itself, causing the star to explode as a supernova, ejecting even more matter..
Which Solar System contains about 100 billion stars?
It is estimated to contain 100–400 billion stars and at least that number of planets.
The Solar System is located at a radius of about 27,000 light-years (8.3 kpc) from the Galactic Center, on the inner edge of the Orion Arm, one of the spiral-shaped concentrations of gas and dust..
Why is the sky blue astronomy quizlet?
Why is the sky blue? Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air.
Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere.
Blue is scattered more than other colors because it travels as shorter, smaller waves..
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.
When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
A neutron star is the collapsed core of a massive supergiant star, which had a total mass of between 10 and 25 solar masses ( M _☉), possibly more if the star was especially metal-rich.
Except for black holes, neutron stars are the smallest and densest known class of stellar objects.
A star is a giant ball of glowing gas that is extremely hot.
Most of the stars you see in the night sky are medium-sized stars like our sun.
But some stars are much smaller, and others are much larger.
The closest star to us is called Proxima Centauri, it is about 25 trillion miles away.
Light from this star takes about four years to reach us.
The star Rigel is about 100,000 times brighter than the Sun and belongs to spectral type B8.
What places a limit on the lifetime of a star? core hydrogen fusion.

About how long will a 2-solar mass star live as a main-sequence star? 2 billion years.
A more massive main-sequence star means ______ nuclear reactions

What is the purpose of the elements of astronomy?

As such a book, The Elements of Astronomy, or the World as it is, and as it appears, is offered by a teacher to the teaching and studying public. Had the writer aimed only to excite an interest in the subject, it would have been shorter and more attractive , but it is intended, likewise, to exercise the student's memory, reason, and imagination.

What is the sky called in astronomy?

In the field of astronomy, the sky is also called the celestial sphere. This is viewed from Earth's surface as an abstract dome on which the Sun, stars, planets, and Moon appear to be traveling. The celestial sphere is conventionally divided into designated areas called constellations.

Astronomy quizlet chapter 12

How old is our planet Earth quizlet?

What are Gabe's sleeping habits?

What is the main sequence astronomy quizlet?

What is the name for the tools astronomers use that collect as much light as possible from an astronomical source and focuses it down to a narrow beam to form an image?

What may happen to a star that is 8 to 20 times the mass of the sun?

Which Solar System contains about 100 billion stars?

Why is the sky blue astronomy quizlet?

What is the purpose of the elements of astronomy?

What is the sky called in astronomy?