Choose the correct statements.

• It is safe to look at the sun if we use a solar telescope.
• If scientists launch a spacecraft to the Sun, they will be able to answer a lot of questions.
• We could answer a lot of questions if we got closer to the Sun.
• If 'Helios' had got too close to the Sun in the 1970s, it would have burnt out.
• We could answer all the questions about the Sun if we use solar telescopes.
• If we launch a spacecraft to the Sun, the astronauts will be able to land on it.