What is a great circle on the celestial sphere representing the sun's apparent path during the year, so called because lunar and solar eclipses can occur only when the moon crosses it.

The equator that the Sun appears to cross is a projection of the Earth's equator onto the sky and is called ___

Fill in the blank:

Earth's movement around the Sun that creates the ____of an up and down pathway of the Sun in the sky!

Fill in the blank:

The plane of the Earth's orbit around the Sun is called the ____ because eclipses of the Sun and the Moon can only occur when the Moon crosses it.

True or False:

The hydrogen fuel that powers the nuclear reactions within stars will begin to run out, and they will enter the final phases of their lifetime.

True or False:

Small stars, like the Sun, will undergo a relatively peaceful and beautiful death that sees them pass through a planetary nebula phase to become a white dwarf, this eventually cools down over time leaving a brown dwarf.

True or False:

When the dust clears, the only thing remains will be a very dense star known as a neutron star, these can often be rapidly spinning and are known as pulsars.

When the star largely explodes it can create a ______.

the area of the shadow of the Moon on the Earth, or the Earth on the Moon, that is fully shaded. This is the area from which a total eclipse of the Sun or the Moon is observed.

the partially shaded area Moon's shadow on the Earth, or the Earth's shadow on the Moon. This is the area from which a partial eclipse of the Sun or the Moon is observed.

True or False:

Solar and lunar eclipses always occur within five weeks of each other.

True or False:

Solar and lunar eclipses always occur within two weeks of each other.

Fill in the blank:

________ eclipses of the Sun occur when the Moon is at apogee (where the Moon is farthest away from the Earth). Being farther away then, it appears smaller and therefore cannot completely cover the Sun. Thus, the outer edge of the Sun appears as a bright ring around the silhouette of the Moon

True or False:

The Moon can appear red/orange during a lunar eclipse because the Earth's atmosphere allows those wavelengths of light to pass through it, and while doing so bends them so they reach the Moon, bounce off it and then return to us back here on Earth.

Most planets and dwarf planets rotate in the same direction that they revolve around the Sun. Negative values of the rotation period shown on this chart indicate that the planet or dwarf planet rotates in the direction opposite to that in which it orbits the Sun. This is called

The distance from the Sun is given in units of the Earth's average distance from the Sun (93 million miles). This distance is called _______

Fill in the blank:

_____ are given in units of the Earth's one year orbital period.

True or False:

The eccentricity of a planet or dwarf planet's orbit is a number which measures how elliptical (oval shaped) the orbit of that planet or dwarf planet is. If the eccentricity of a planet or dwarf planet's orbit is 0, the orbit is a circle. Most planets and dwarf planets have eccentricities less than 0, so their orbits are elliptical.

The universe that we are a part of began as a singular event. That has been measured to have happened 13.8 billion years ago. Is called?

What is a system of millions or billions of stars, gas and dust held together by gravity in space?

A galaxy with a flat, spiral shape

It has a bar shape in the middle of it, and is thus called a barred spiral galaxy

A galaxy with a ellipsoidal or spherical shape

A galaxy with no defined shape

Two irregular galaxies close to the Milky Way

Select all that applies to the Sun

Select all that applies to the Sun.

The Sun rotates at different speeds from its equator to its poles and this is called

Fill in the blank:When some of these particles in the solar wind do interact with the Earth's magnetic field, it produces _____ in the Earth's atmosphere

As the sun rotates, this magnetic field becomes ______.

True or false:

This twisting of the Sun's magnetic field causes massive, explosive eruptions on the surface of the Sun.

Fill in the blank:

The seasons of the Earth are caused by the ____ degree tilt of the Earth's axis as it orbits the Sun.

Fill in the blank:

In the northern hemisphere: when the Sun reaches its highest point in the sky on around June 21, that is called the _______ and is the longest day of the year.

Fill in the blank:

In the northern hemisphere when the Sun crosses the celestial equator on around September 23, that is called the fall or ______ and nighttime and daytime are of the same length.

Fill in the blank:

In the northern hemisphere, when the Sun reaches its lowest point in the sky on December 21, that is called the ____ and is the shortest day of the year.

Fill int he blank:

In the northern hemisphere, when the Sun crosses the celestial equator in the spring time on around March 20, that is called the spring or _____ and nighttime and daytime are of the same length.

True or False:

In the southern hemisphere, these seasons are reversed from the northern hemisphere

True or False:

Nebulae are simply clouds of gas and dust in space. The principle types are listed below. Some nebulae are the birthplace of stars (the Orion Nebula). Some are the remains of dead stars (planetary nebulae and supernova remnants). Some are mixtures of several different types of nebulae (the Trifid Nebula -- a combination of emission, reflection and dark nebulae)

A type of nebula that is a cloud of high temperature gas. Within this type of nebula, a star energizes the atoms in the cloud with ultraviolet radiation. The process is similar to that of a neon light. This causes the nebula to glow. Emission nebulae tend to be red in color because of the abundance of hydrogen. Additional colors, such as blue and green, can be produced by the atoms of other elements, but hydrogen is almost always the most abundant.

A type of nebula differs from an emission nebula in that it does not emit radiation of its own. It is a cloud of dust and gas that reflects the light energy from a nearby star or group of stars. They usually tend to be blue in color because of the way that the light is scattered. Blue light is scattered more efficiently.

A type of nebula that is a cloud of dust that blocks the light from objects behind it. They are very similar to reflection nebulae in composition and look different primarily because of the placement of the light source.

They are usually seen together with emission and reflection nebulae. The Horsehead Nebula in Orion is probably the most famous example of a dark nebula. It is a dark region of dust in the shape of a horse's head that blocks the light from a much larger emission nebula behind it.

Type of nebula that is a shell of gas produced by a star as it nears the end of its life cycle. Their name can be a bit misleading. They actually have nothing to do with planets. These nebulae were given this name because they often look like planets due to their round shape. The outer shell of gas is usually illuminated by the remains of the star -- a white dwarf star -- at its center. The Ring Nebula in Lyra is one of the best examples this nebula.

This is are created when a star ends it life in a massive explosion known as a supernova. The explosion blows a large amount of the star's matter out into space. This cloud of matter glows with the remains of the star that created it. One of the best examples of it is remnant is the crab Nebula in Taurus. It is illuminated by a pulsar which was created by it

What moon phase is this:

Moon phase type:

Moon phase type:

Moon phase type:

Moon phase type:

what moon type is this:

Moon phase type:

From Earth which moon phase is this:

From Earth, which moon phase is this?

From Earth, which moon phase is this:

From Earth, which moon phase is this?

From Earth, which moon phase is this?

From Earth, which type of moon phase is this

Choose the correct moon phases in order from A-H: