How bright a year is.B. A year that is not heavy.C. How far light travels in a year.D. A year that is not dark.)3. What travels faster than light?A. A plane. B. A race car.C.A spaceship.D.Nothing)4. How long would ittake light to reach Alpha Centauri?A. 300,000 ...
Deneb isa bluish-white supergiantaround 200 times the size of the Sun and burning through its fuel at a rapid rate. Deneb shines bright in the constellation Cygnus. Some well-known bright stars such as Vega, Sirius, and Alpha Centauri appear bright in our sky primarily because they are relat...
Alpha Centauri, the nearest star visible to the unaided eye, is at a distance 270,000 times the distance between Earth and the Sun. That's 4 light years, so we see Alpha Centauri as it was 4 years ago. Somebright starsare much more distant still. Betelgeuse, in the constellationOrion,...
And if the astronomer from the 21st century remembers the coordinates of a few very bright stars as seen from Earth that could help narrow it down. Most of the stars that appear very bright as seen from Earth appear bright as seen from Earth because they are actually...
When you draw a (imaginary) line from... Learn more about this topic: The Horizon Coordinate System from Chapter 21/ Lesson 5 21K The horizon system is used to find objects in the sky and determine their positioning. Learn more about the horizon coordinate system, the celestial horizon, alt...
Quasar 3C 273 is so bright that a 15cm telescope can detect the hydrogen alpha line in its spectrum in one hour. On Earth the hydrogen alpha has a wavelength of 0.66 microns, but for 3C 273 this line is shifted to 0.76 microns. ...
My life is going fast, like a ship under full sail, like an eagle plummeting to its prey. Even if I say, ‘I’ll put all this behind me, I’ll look on the bright side and force a smile,’ All these troubles would still be like grit in my gut ...
Like all other stars in the universe, the Sun is a huge, bright sphere of hot, glowing gas held together by its own gravity. It lives in the Milky Way Galaxy, along with approximately 400 billion other stars. They all work by the same basic principle: they fuse atoms in their cores ...
Alpha Centauri, is about the same size as our sun and can be seen from earth. In other words, in our model it’s as big as our basketball, it’s 4400 miles away, and we can see it, but only as a point of light. So, if we wanted to create this star system, to be in persp...
题目Our Neighbourhood Stars Most of the stars that we see in the night sky are billions of kilometers away.But there is one star which is much closer to the Earth.We see it every day as a large,bright ball in the sky.It is called the Sun.It is the only star...