Chapter 23 and 24
The spritzer space telescope is
A thermal infrared detecting telescope
The frequency of sunspots and related solar activity is
An 11 year cycle
Hydrogen "burning" in stars is
An atomic reaction that fuses 4 protons to make a helium nucleus, releasing energy by converting mass to energy
Xrays have shorter wavelength than visible light; therefore Xrays _____
Are higher energy then light waves
If you live at high altitude, when do you expect to see the aurora
At times of high sunspot activity, during the active sun
The appearing path of the sun spot the celestial sphere is called the
Ecliptic
Earth is closest to the sun in july
False
The angular distance north and south of the celestial equator is called right acension
False
To improve the resolution of radio telescopes, astronomers
Group smaller telescopes in arrays like the very large array in new mexico
What fuel is the source of energy from the Sun?
Hydrogen
What does Einstein's formula e = mc2 have to do with the sun
It relates to how much energy is carried away from the sun when mass is ejected from the sun at speed c
The true shape of the planetary orbits was discovered by
Johannes Kepler
Three laws of planetary motion were discovered by
Johannes Kepler
The sun is already 5 billion years old and is considered to be a ________ star
Middle aged
The first modern astronomer to propose a sun-centered universe was
Nicolaus Copernicus
________ is the source of the suns energy
Nuclear fusion
The layer of the sun that radiates most of the light that reaches earth is called
Photosphere
A concentration of material above the solar surface that appears as a bright arch like structure
Prominence
The _____ day is the time it takes for earth to make one complete rotation with respect to a star other than our sun
Sidereal
Which of these men formulated the law of universal gravitation
Sir Isaac Newton
The scientist determined the nature of the forces that kept the planets in their orbits
Sir issac Newton
If solar flares pose a danger to orbiting spacecraft and astronauts, how much warning is there for the danger?
The primary danger is from high energy particles that travel at the speed of the solar wind 500km/s, so there is ample warning of 3-5 days.
Prominences and solar flares present dangers to astronomers primarily because
They can overheat spacecraft
Hale discovered that sunspots were associated with magnetic field. What happens to these magnetic fields during a full sunspot cycle
They change polarity
The apparent annual path of the sun upon the celestial sphere is called the ecliptic
True
In a radio telescope the electromagnetic energy is gathered by
a parabolic metallic mirror, commonly wire mesh
A very slow motion of Earth's axis that requires 26,000 years to complete is called
axial precession
In the Ptolemaic (Greek) model of the universe, the stars are attached to the
celestial sphere
One of the discoveries which led to the modern view of the solar system was that the orbits of the planets are
ellipses
Which of the following is not considered a form of electromagnetic radiation
gravity
The sun produces energy by converting
hydrogen nuclei to helium nuclei
Which of the following colors has the longest wavelength
red
The most explosive events to occur on the sun are
solar flares
The most conspicuous features on the surface of the sun are dark areas called
sunspots
Galileo observed several features using the telescope. Which one of the following did he not discover?
the two moons of Mars
Why would astronomers be interested in placing a gamma ray detecting observatory in space?
to map high-energy electromagnetic waves from distant sources that would be blocked out or scattered by Earth's atmosphere