Telescopes
An instrument that collects and focuses electromagnetic radiation is a
Telescope
The distance light travels through space in a year is one
Light-year
What do astronomers use to determine the elements found in stars?
Spectrograph
What determines the life cycle of a star?
Its mass
Most stars are members of groups of two or more stars, called __________
Star Systems
A building that houses telescopes is called an
Observatory
This uses powers of 10 to write very large or very small numbers in shorter form
Scientific notation
What are the two ways the brightness of a star is described?
Absolute and apparent
This is a large cloud of gas and dust in space
Nebula
Galaxies are held together by
Gravity
Prisms make a rainbow out of white light. The rainbow is called a
Spectrum
A star looks like it’s located one place in the sky in January and a different place in June. What is this phenomenon called?
Parallax
List the three colors of stars from hottest to coolest
Blue/white, yellow, red
When is a star born?
When nuclear fusion starts
What type of galaxies have mostly old stars, without a lot of active star formation
Elliptical Galaxies
Electromagnetic radiation visible to the human eye is called
Visible Light
After six months, an astronomer notices that star A moves a greater distance than star B. What does that tell you about star A?
Star A is closer than star B
The diagonal area on an H-R Diagram where more than 90% of all stars are found is called the
Main sequence
What is the progression astronomers expect our sun to follow as it runs out of fuel?
What are the two major types of star clusters?
Open and Globular
An optical telescope that uses convex lenses to gather and focus light is a
Refracting telescope
The _______ is made up of all space and everything in it
Universe
What are the five ways to classify stars?
This appears to emit regular bursts of radio waves
Pulsar
New stars tend to form in the ________ of a spiral galaxy
Arms