Out of this World. Space 13.1 Intro to Space Page 400. The questions you asked about Space. How big are stars? How many are there in the universe? Are there aliens? What about gravity? What are the constellations? What are stars? How do they glow? .
13.1 Intro to Space
How big are stars? How many are there in the universe?
Are there aliens? What about gravity?
What are the constellations? What are stars? How do they glow?
Nonluminous vs. Luminous
Star vs. Planet
Space is cold, dark, and very empty.
Scattered everywhere are stars, planets, moons, asteroids, comets, meteoroids, and dust.
People have spent years looking up at the sky and studying the things in space. First they looked with their eyes, then with telescopes.
Today people can travel to space aboard space shuttles, and spacecraft to other planets and moons.
Never look directly at the Sun. You can permanently damage your eyes.
Scientist Galileo Galilei went blind after observing the Sun with his telescope.
Sunspot Loops in Ultraviolet
The Universe is everything that exists, including all matter and energy everywhere.
Astronomy is the study of what is beyond the Earth. It is the oldest science.
As early as 2000 BC, Babylonians were using the sundial, the oldest known instrument for telling time. The shadow of the sundial correlates with the Sun’s position in the sky and hence with the time of day.
A constellation is group of stars that seem to form a pattern.
This is a picture of what ancient people thought the constellation Leo looked like.