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