galaxies
What is a galaxy?
A galaxy is a group of millions or billions of stars, gas, stellar dust, and dark matter held together by gravitational attraction.
What is the name of the planetary system we live in?
The Solar System
What is the estimated frequency of a large asteroid hitting Earth?
Once every 130,000 years.
What is Ceres?
Ceres is the largest known asteroid in the asteroid belt and is also classified as a dwarf planet.
What is dark matter?
Dark matter is a form of matter that doesn’t emit, absorb, or reflect light, making it invisible, but its presence is inferred from gravitational effects.
Name the three main types of galaxies.
Spiral galaxies, elliptical galaxies, and irregular galaxies.
What is a planetary system?
A planetary system is a system of objects dynamically connected by gravity and occasionally magnetic fields.
Which vegetable is said to look like an asteroid?
Potatoes
What is the diameter of Ceres?
975 km
What is the name of the group of galaxies that the Milky Way is part of?
The Local Group
What type of galaxy is the Milky Way?
The Milky Way is a barred spiral galaxy.
Astronomers said there were _____ other stars with planets orbiting them
Astronomers said there were 3200 other stars with planets orbiting them
What is the asteroid belt?
The asteroid belt is a region of space between the orbits of Mars and Jupiter. The asteroid belt contains most of the asteroids in the solar system and is made of millions and millions of asteroids
Why is Ceres considered a dwarf planet?
Because of its round shape.
What is the approximate diameter of the Milky Way?
100,000 light-years.
What is the name of the galaxy that the Milky Way is expected to collide with in about 4.5 billion years?
The Andromeda Galaxy.
Name the four types of planetary systems.
Similar, Ordered, Anti-Ordered, and Mixed.
What are binary and triple asteroid systems?
They are pairs of asteroids that are about the same size and move around each other, called binary asteroids. In some cases, there are even three asteroids that are connected in the same way, which we call triple asteroid systems.
What unique feature does Ceres have beneath its surface?
Water ice
What is the main reason Ceres is classified as a dwarf planet instead of just an asteroid?
Because it is large enough to be spherical due to its own gravity, unlike most irregularly shaped asteroids
What are the four main components of a galaxy?
The disk (with spiral arms), the halo, the central bulge, and the center (or black hole).
In an "Ordered" planetary system, how does the mass of planets typically change with distance from the star?
The mass tends to increase with distance from the star.
What is the Yarkovsky effect?
The Yarkovsky effect (heat from the Sun) can slowly push asteroids toward Earth
How does Ceres compare in size to Earth and the Moon?
Ceres is much smaller than both Earth (12,742 km diameter) and the Moon (3,474 km diameter).
guess a number for 1-5
3